I just tested by recording a directory for epubs and the server displays good covers.

The error must come from Comics.

20160829 22:32:17 [main] INFO com.ubooquity.Ubooquity - Running with the following parameters - headless: false, port: 2202, webadmin: true, host: null, debug: false, execdir: /
20160829 22:32:17 [main] INFO com.ubooquity.Ubooquity - #############################
20160829 22:32:17 [main] INFO com.ubooquity.Ubooquity - # Starting Ubooquity #
20160829 22:32:17 [main] INFO com.ubooquity.Ubooquity - #############################
20160829 22:32:17 [main] INFO com.ubooquity.Ubooquity - Java version: 1.8.0_60
20160829 22:32:17 [main] INFO com.ubooquity.Ubooquity - Java vendor: Oracle Corporation
20160829 22:32:17 [main] INFO com.ubooquity.Ubooquity - Max heap size available: 247 MB
20160829 22:32:17 [main] INFO com.ubooquity.Ubooquity - OS name: Linux
20160829 22:32:17 [main] INFO com.ubooquity.Ubooquity - OS version: 3.2.40
20160829 22:32:17 [main] INFO com.ubooquity.Ubooquity - OS architecture: arm
20160829 22:32:17 [main] INFO com.ubooquity.Ubooquity - Loading local version info
20160829 22:32:17 [main] INFO com.ubooquity.Ubooquity - Ubooquity 1.10.1 built on 2016-05-10 at 20:36
20160829 22:32:17 [main] INFO com.ubooquity.Ubooquity - Creating application folders
20160829 22:32:17 [main] INFO com.ubooquity.Ubooquity - Loading preferences
20160829 22:32:22 [main] INFO com.ubooquity.c - Starting internal server...
20160829 22:32:22 [Scanner thread] INFO com.ubooquity.data.feeder.a - Scanning books directories
20160829 22:32:22 [Scanner thread] INFO com.ubooquity.data.feeder.a - Finished scanning books directories, populating folders content cache
20160829 22:32:23 [main] INFO com.ubooquity.c - Reverse proxy prefix is not activated
20160829 22:32:23 [main] INFO com.ubooquity.c - Internal server started. Listening on port 2202
20160829 22:32:23 [Scanner thread] INFO com.ubooquity.data.feeder.a - Books folder content cache populated
20160829 22:32:23 [Scanner thread] INFO com.ubooquity.data.feeder.a - Scanning comics directories
20160829 22:32:23 [Scanner thread] INFO com.ubooquity.data.feeder.a - Finished scanning comics directories, populating folders content cache
20160829 22:32:23 [Scanner thread] INFO com.ubooquity.data.feeder.a - Comics folder content cache populated
20160829 22:32:23 [Scanner thread] INFO com.ubooquity.data.feeder.a - Comics statistics: [total: 0, added or updated: 0, removed: 0]
20160829 22:32:23 [Scanner thread] INFO com.ubooquity.data.feeder.a - Books statistics: [total: 6, added or updated: 0, removed: 0]
20160829 22:32:24 [Timer-0] INFO com.ubooquity.Ubooquity - Checking latest available Ubooquity version from website
20160829 22:32:24 [Timer-0] INFO com.ubooquity.Ubooquity - Latest version available: 1.10.1 - Current version: 1.10.1
20160829 22:33:06 [pool-1-thread-6] INFO com.ubooquity.provider.webadmin.j - Applying preferences modifications and restarting server (from webadmin)
20160829 22:33:06 [pool-1-thread-6] INFO com.ubooquity.c - Stopping internal server...
20160829 22:33:06 [pool-1-thread-6] INFO com.ubooquity.data.feeder.a - Aborting content scan...
20160829 22:33:06 [pool-1-thread-6] INFO com.ubooquity.data.feeder.a - Waiting for scanner thread to stop
20160829 22:33:06 [pool-1-thread-6] INFO com.ubooquity.data.feeder.a - Scanner thread stopped
20160829 22:33:06 [pool-1-thread-6] INFO com.ubooquity.c - Internal server stopped
20160829 22:33:06 [pool-1-thread-6] INFO com.ubooquity.Ubooquity - Saving preferences
20160829 22:33:06 [pool-1-thread-6] INFO com.ubooquity.c - Starting internal server...
20160829 22:33:06 [Scanner thread] INFO com.ubooquity.data.feeder.a - Scanning books directories
20160829 22:33:06 [pool-1-thread-6] INFO com.ubooquity.c - Reverse proxy prefix is not activated
20160829 22:33:06 [pool-1-thread-6] INFO com.ubooquity.c - Internal server started. Listening on port 2202
20160829 22:33:06 [Scanner thread] INFO com.ubooquity.data.feeder.a - Finished scanning books directories, populating folders content cache
20160829 22:33:06 [Scanner thread] INFO com.ubooquity.data.feeder.a - Books folder content cache populated
20160829 22:33:06 [Scanner thread] INFO com.ubooquity.data.feeder.a - Scanning comics directories
20160829 22:33:06 [Scanner thread] WARN com.ubooquity.data.database.b - Could not find id of root path /volume1/Media/Books (ignore this warning if you just added a new root directory)
20160829 22:33:06 [Scanner thread] INFO com.ubooquity.data.database.b - Inserting/updating comic entry in database : /volume1/Media/Books
20160829 22:33:06 [Scanner thread] INFO com.ubooquity.data.database.b - Inserting/updating comic entry in database : /volume1/Media/Books/Frank Herbert - Cycle de Dune
20160829 22:33:06 [Scanner thread] INFO com.ubooquity.b.c - Reading metadata of comic file: /volume1/Media/Books/Civil War 01 - Guerre Civile.cbr
20160829 22:33:08 [Scanner thread] INFO com.ubooquity.data.database.b - Inserting/updating comic entry in database : /volume1/Media/Books/Civil War 01 - Guerre Civile.cbr
20160829 22:33:14 [Scanner thread] ERROR com.ubooquity.Ubooquity - Uncaught exception on thread: Scanner thread
java.lang.UnsatisfiedLinkError: no javalcms in java.library.path
   at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1864) ~[na:1.8.0_60]
   at java.lang.Runtime.loadLibrary0(Runtime.java:870) ~[na:1.8.0_60]
   at java.lang.System.loadLibrary(System.java:1122) ~[na:1.8.0_60]
   at sun.java2d.cmm.lcms.LCMS$1.run(LCMS.java:210) ~[na:1.8.0_60]
   at java.security.AccessController.doPrivileged(Native Method) ~[na:1.8.0_60]
   at sun.java2d.cmm.lcms.LCMS.getModule(LCMS.java:203) ~[na:1.8.0_60]
   at sun.java2d.cmm.lcms.LcmsServiceProvider.getModule(LcmsServiceProvider.java:34) ~[na:1.8.0_60]
   at sun.java2d.cmm.CMMServiceProvider.getColorManagementModule(CMMServiceProvider.java:31) ~[na:1.8.0_60]
   at sun.java2d.cmm.CMSManager.getModule(CMSManager.java:76) ~[na:1.8.0_60]
   at java.awt.color.ICC_Profile.getInstance(ICC_Profile.java:783) ~[na:1.8.0_60]
   at java.awt.color.ICC_Profile.getInstance(ICC_Profile.java:1017) ~[na:1.8.0_60]
   at com.twelvemonkeys.imageio.plugins.jpeg.JPEGImageReader.readICCProfileSafe(Unknown Source) ~[imageio-jpeg-3.1.0.jar.44269835448613483.tmp:3.1.0]
   at com.twelvemonkeys.imageio.plugins.jpeg.JPEGImageReader.getEmbeddedICCProfile(Unknown Source) ~[imageio-jpeg-3.1.0.jar.44269835448613483.tmp:3.1.0]
   at com.twelvemonkeys.imageio.plugins.jpeg.JPEGImageReader.read(Unknown Source) ~[imageio-jpeg-3.1.0.jar.44269835448613483.tmp:3.1.0]
   at javax.imageio.ImageIO.read(ImageIO.java:1448) ~[na:1.8.0_60]
   at javax.imageio.ImageIO.read(ImageIO.java:1352) ~[na:1.8.0_60]
   at com.ubooquity.fileformat.cbr.a.a(SourceFile:89) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.f.a.a(SourceFile:41) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.data.feeder.b.a(SourceFile:63) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.data.feeder.a.b(SourceFile:531) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.data.feeder.a.c(SourceFile:470) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.data.feeder.a.b(SourceFile:35) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.data.feeder.a$1.run(SourceFile:123) ~[Ubooquity.jar:1.10.1]
   at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_60]
20160829 22:33:47 [pool-1-thread-7] ERROR com.ubooquity.Ubooquity - Uncaught exception on thread: pool-1-thread-7
java.lang.UnsatisfiedLinkError: no javalcms in java.library.path
   at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1864) ~[na:1.8.0_60]
   at java.lang.Runtime.loadLibrary0(Runtime.java:870) ~[na:1.8.0_60]
   at java.lang.System.loadLibrary(System.java:1122) ~[na:1.8.0_60]
   at sun.java2d.cmm.lcms.LCMS$1.run(LCMS.java:210) ~[na:1.8.0_60]
   at java.security.AccessController.doPrivileged(Native Method) ~[na:1.8.0_60]
   at sun.java2d.cmm.lcms.LCMS.getModule(LCMS.java:203) ~[na:1.8.0_60]
   at sun.java2d.cmm.lcms.LcmsServiceProvider.getModule(LcmsServiceProvider.java:34) ~[na:1.8.0_60]
   at sun.java2d.cmm.CMMServiceProvider.getColorManagementModule(CMMServiceProvider.java:31) ~[na:1.8.0_60]
   at sun.java2d.cmm.CMSManager.getModule(CMSManager.java:76) ~[na:1.8.0_60]
   at java.awt.color.ICC_Profile.getInstance(ICC_Profile.java:783) ~[na:1.8.0_60]
   at java.awt.color.ICC_Profile.getInstance(ICC_Profile.java:1017) ~[na:1.8.0_60]
   at java.awt.color.ICC_Profile.getInstance(ICC_Profile.java:982) ~[na:1.8.0_60]
   at java.awt.color.ICC_Profile$2.run(ICC_Profile.java:933) ~[na:1.8.0_60]
   at java.awt.color.ICC_Profile$2.run(ICC_Profile.java:929) ~[na:1.8.0_60]
   at java.security.AccessController.doPrivileged(Native Method) ~[na:1.8.0_60]
   at java.awt.color.ICC_Profile.getStandardProfile(ICC_Profile.java:928) ~[na:1.8.0_60]
   at java.awt.color.ICC_Profile.getDeferredInstance(ICC_Profile.java:1075) ~[na:1.8.0_60]
   at java.awt.color.ICC_Profile.getInstance(ICC_Profile.java:847) ~[na:1.8.0_60]
   at java.awt.color.ColorSpace.getInstance(ColorSpace.java:298) ~[na:1.8.0_60]
   at javax.imageio.ImageTypeSpecifier.(ImageTypeSpecifier.java:73) ~[na:1.8.0_60]
   at com.sun.imageio.plugins.png.PNGImageReader.getImageTypes(PNGImageReader.java:1405) ~[na:1.8.0_60]
   at com.sun.imageio.plugins.png.PNGImageReader.readImage(PNGImageReader.java:1310) ~[na:1.8.0_60]
   at com.sun.imageio.plugins.png.PNGImageReader.read(PNGImageReader.java:1606) ~[na:1.8.0_60]
   at javax.imageio.ImageIO.read(ImageIO.java:1448) ~[na:1.8.0_60]
   at javax.imageio.ImageIO.read(ImageIO.java:1352) ~[na:1.8.0_60]
   at com.ubooquity.provider.theme.a.a(SourceFile:234) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.provider.theme.a.g(SourceFile:205) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.provider.comic.b.a(SourceFile:191) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c.a(SourceFile:324) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c.a(SourceFile:58) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c$1.a(SourceFile:133) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e.a(SourceFile:287) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e$f.a(SourceFile:830) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e$1$1.run(SourceFile:210) ~[Ubooquity.jar:1.10.1]
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_60]
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[na:1.8.0_60]
   at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_60]
20160829 22:33:47 [pool-1-thread-8] ERROR com.ubooquity.Ubooquity - Uncaught exception on thread: pool-1-thread-8
java.lang.NoClassDefFoundError: Could not initialize class javax.imageio.ImageTypeSpecifier
   at com.sun.imageio.plugins.png.PNGImageReader.getImageTypes(PNGImageReader.java:1405) ~[na:1.8.0_60]
   at com.sun.imageio.plugins.png.PNGImageReader.readImage(PNGImageReader.java:1310) ~[na:1.8.0_60]
   at com.sun.imageio.plugins.png.PNGImageReader.read(PNGImageReader.java:1606) ~[na:1.8.0_60]
   at javax.imageio.ImageIO.read(ImageIO.java:1448) ~[na:1.8.0_60]
   at javax.imageio.ImageIO.read(ImageIO.java:1352) ~[na:1.8.0_60]
   at com.ubooquity.provider.theme.a.a(SourceFile:234) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.provider.theme.a.g(SourceFile:205) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.provider.comic.b.a(SourceFile:191) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c.a(SourceFile:324) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c.a(SourceFile:58) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c$1.a(SourceFile:133) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e.a(SourceFile:287) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e$f.a(SourceFile:830) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e$1$1.run(SourceFile:210) ~[Ubooquity.jar:1.10.1]
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_60]
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[na:1.8.0_60]
   at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_60]
20160829 22:33:47 [pool-1-thread-9] ERROR com.ubooquity.Ubooquity - Uncaught exception on thread: pool-1-thread-9
java.lang.NoClassDefFoundError: Could not initialize class javax.imageio.ImageTypeSpecifier
   at com.sun.imageio.plugins.png.PNGImageReader.getImageTypes(PNGImageReader.java:1405) ~[na:1.8.0_60]
   at com.sun.imageio.plugins.png.PNGImageReader.readImage(PNGImageReader.java:1310) ~[na:1.8.0_60]
   at com.sun.imageio.plugins.png.PNGImageReader.read(PNGImageReader.java:1606) ~[na:1.8.0_60]
   at javax.imageio.ImageIO.read(ImageIO.java:1448) ~[na:1.8.0_60]
   at javax.imageio.ImageIO.read(ImageIO.java:1352) ~[na:1.8.0_60]
   at com.ubooquity.provider.theme.a.a(SourceFile:234) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.provider.theme.a.g(SourceFile:205) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.provider.comic.b.a(SourceFile:191) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c.a(SourceFile:324) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c.a(SourceFile:58) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c$1.a(SourceFile:133) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e.a(SourceFile:287) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e$f.a(SourceFile:830) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e$1$1.run(SourceFile:210) ~[Ubooquity.jar:1.10.1]
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_60]
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[na:1.8.0_60]
   at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_60]
20160829 22:33:47 [pool-1-thread-13] ERROR com.ubooquity.Ubooquity - Uncaught exception on thread: pool-1-thread-13
java.lang.NoClassDefFoundError: Could not initialize class javax.imageio.ImageTypeSpecifier
   at com.sun.imageio.plugins.png.PNGImageReader.getImageTypes(PNGImageReader.java:1405) ~[na:1.8.0_60]
   at com.sun.imageio.plugins.png.PNGImageReader.readImage(PNGImageReader.java:1310) ~[na:1.8.0_60]
   at com.sun.imageio.plugins.png.PNGImageReader.read(PNGImageReader.java:1606) ~[na:1.8.0_60]
   at javax.imageio.ImageIO.read(ImageIO.java:1448) ~[na:1.8.0_60]
   at javax.imageio.ImageIO.read(ImageIO.java:1352) ~[na:1.8.0_60]
   at com.ubooquity.provider.theme.a.a(SourceFile:234) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.provider.theme.a.g(SourceFile:205) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.provider.comic.b.a(SourceFile:191) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c.a(SourceFile:324) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c.a(SourceFile:58) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c$1.a(SourceFile:133) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e.a(SourceFile:287) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e$f.a(SourceFile:830) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e$1$1.run(SourceFile:210) ~[Ubooquity.jar:1.10.1]
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_60]
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[na:1.8.0_60]
   at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_60]
20160829 22:33:54 [pool-1-thread-20] ERROR com.ubooquity.Ubooquity - Uncaught exception on thread: pool-1-thread-20
java.lang.NoClassDefFoundError: Could not initialize class javax.imageio.ImageTypeSpecifier
   at com.sun.imageio.plugins.png.PNGImageReader.getImageTypes(PNGImageReader.java:1405) ~[na:1.8.0_60]
   at com.sun.imageio.plugins.png.PNGImageReader.readImage(PNGImageReader.java:1310) ~[na:1.8.0_60]
   at com.sun.imageio.plugins.png.PNGImageReader.read(PNGImageReader.java:1606) ~[na:1.8.0_60]
   at javax.imageio.ImageIO.read(ImageIO.java:1448) ~[na:1.8.0_60]
   at javax.imageio.ImageIO.read(ImageIO.java:1352) ~[na:1.8.0_60]
   at com.ubooquity.provider.theme.a.a(SourceFile:234) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.provider.theme.a.g(SourceFile:205) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.provider.comic.b.a(SourceFile:191) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c.a(SourceFile:324) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c.a(SourceFile:58) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c$1.a(SourceFile:133) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e.a(SourceFile:287) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e$f.a(SourceFile:830) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e$1$1.run(SourceFile:210) ~[Ubooquity.jar:1.10.1]
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_60]
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[na:1.8.0_60]
   at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_60]
20160829 22:33:54 [pool-1-thread-19] ERROR com.ubooquity.Ubooquity - Uncaught exception on thread: pool-1-thread-19
java.lang.NoClassDefFoundError: Could not initialize class javax.imageio.ImageTypeSpecifier
   at com.sun.imageio.plugins.png.PNGImageReader.getImageTypes(PNGImageReader.java:1405) ~[na:1.8.0_60]
   at com.sun.imageio.plugins.png.PNGImageReader.readImage(PNGImageReader.java:1310) ~[na:1.8.0_60]
   at com.sun.imageio.plugins.png.PNGImageReader.read(PNGImageReader.java:1606) ~[na:1.8.0_60]
   at javax.imageio.ImageIO.read(ImageIO.java:1448) ~[na:1.8.0_60]
   at javax.imageio.ImageIO.read(ImageIO.java:1352) ~[na:1.8.0_60]
   at com.ubooquity.provider.theme.a.a(SourceFile:234) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.provider.theme.a.g(SourceFile:205) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.provider.comic.b.a(SourceFile:191) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c.a(SourceFile:324) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c.a(SourceFile:58) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c$1.a(SourceFile:133) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e.a(SourceFile:287) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e$f.a(SourceFile:830) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e$1$1.run(SourceFile:210) ~[Ubooquity.jar:1.10.1]
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_60]
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[na:1.8.0_60]
   at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_60]
20160829 22:33:54 [pool-1-thread-17] ERROR com.ubooquity.Ubooquity - Uncaught exception on thread: pool-1-thread-17
java.lang.NoClassDefFoundError: Could not initialize class javax.imageio.ImageTypeSpecifier
   at com.sun.imageio.plugins.png.PNGImageReader.getImageTypes(PNGImageReader.java:1405) ~[na:1.8.0_60]
   at com.sun.imageio.plugins.png.PNGImageReader.readImage(PNGImageReader.java:1310) ~[na:1.8.0_60]
   at com.sun.imageio.plugins.png.PNGImageReader.read(PNGImageReader.java:1606) ~[na:1.8.0_60]
   at javax.imageio.ImageIO.read(ImageIO.java:1448) ~[na:1.8.0_60]
   at javax.imageio.ImageIO.read(ImageIO.java:1352) ~[na:1.8.0_60]
   at com.ubooquity.provider.theme.a.a(SourceFile:234) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.provider.theme.a.g(SourceFile:205) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.provider.comic.b.a(SourceFile:191) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c.a(SourceFile:324) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c.a(SourceFile:58) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c$1.a(SourceFile:133) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e.a(SourceFile:287) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e$f.a(SourceFile:830) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e$1$1.run(SourceFile:210) ~[Ubooquity.jar:1.10.1]
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_60]
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[na:1.8.0_60]
   at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_60]
20160829 22:33:54 [pool-1-thread-16] ERROR com.ubooquity.Ubooquity - Uncaught exception on thread: pool-1-thread-16
java.lang.NoClassDefFoundError: Could not initialize class javax.imageio.ImageTypeSpecifier
   at com.sun.imageio.plugins.png.PNGImageReader.getImageTypes(PNGImageReader.java:1405) ~[na:1.8.0_60]
   at com.sun.imageio.plugins.png.PNGImageReader.readImage(PNGImageReader.java:1310) ~[na:1.8.0_60]
   at com.sun.imageio.plugins.png.PNGImageReader.read(PNGImageReader.java:1606) ~[na:1.8.0_60]
   at javax.imageio.ImageIO.read(ImageIO.java:1448) ~[na:1.8.0_60]
   at javax.imageio.ImageIO.read(ImageIO.java:1352) ~[na:1.8.0_60]
   at com.ubooquity.provider.theme.a.a(SourceFile:234) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.provider.theme.a.g(SourceFile:205) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.provider.comic.b.a(SourceFile:191) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c.a(SourceFile:324) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c.a(SourceFile:58) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c$1.a(SourceFile:133) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e.a(SourceFile:287) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e$f.a(SourceFile:830) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e$1$1.run(SourceFile:210) ~[Ubooquity.jar:1.10.1]
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_60]
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[na:1.8.0_60]
   at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_60]
20160829 22:33:54 [pool-1-thread-18] ERROR com.ubooquity.Ubooquity - Uncaught exception on thread: pool-1-thread-18
java.lang.NoClassDefFoundError: Could not initialize class javax.imageio.ImageTypeSpecifier
   at com.sun.imageio.plugins.png.PNGImageReader.getImageTypes(PNGImageReader.java:1405) ~[na:1.8.0_60]
   at com.sun.imageio.plugins.png.PNGImageReader.readImage(PNGImageReader.java:1310) ~[na:1.8.0_60]
   at com.sun.imageio.plugins.png.PNGImageReader.read(PNGImageReader.java:1606) ~[na:1.8.0_60]
   at javax.imageio.ImageIO.read(ImageIO.java:1448) ~[na:1.8.0_60]
   at javax.imageio.ImageIO.read(ImageIO.java:1352) ~[na:1.8.0_60]
   at com.ubooquity.provider.theme.a.a(SourceFile:234) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.provider.theme.a.g(SourceFile:205) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.provider.comic.b.a(SourceFile:191) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c.a(SourceFile:324) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c.a(SourceFile:58) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c$1.a(SourceFile:133) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e.a(SourceFile:287) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e$f.a(SourceFile:830) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e$1$1.run(SourceFile:210) ~[Ubooquity.jar:1.10.1]
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_60]
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[na:1.8.0_60]
   at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_60]
20160829 22:33:54 [pool-1-thread-15] ERROR com.ubooquity.Ubooquity - Uncaught exception on thread: pool-1-thread-15
java.lang.NoClassDefFoundError: Could not initialize class javax.imageio.ImageTypeSpecifier
   at com.sun.imageio.plugins.png.PNGImageReader.getImageTypes(PNGImageReader.java:1405) ~[na:1.8.0_60]
   at com.sun.imageio.plugins.png.PNGImageReader.readImage(PNGImageReader.java:1310) ~[na:1.8.0_60]
   at com.sun.imageio.plugins.png.PNGImageReader.read(PNGImageReader.java:1606) ~[na:1.8.0_60]
   at javax.imageio.ImageIO.read(ImageIO.java:1448) ~[na:1.8.0_60]
   at javax.imageio.ImageIO.read(ImageIO.java:1352) ~[na:1.8.0_60]
   at com.ubooquity.provider.theme.a.a(SourceFile:234) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.provider.theme.a.g(SourceFile:205) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.provider.comic.b.a(SourceFile:191) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c.a(SourceFile:324) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c.a(SourceFile:58) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c$1.a(SourceFile:133) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e.a(SourceFile:287) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e$f.a(SourceFile:830) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e$1$1.run(SourceFile:210) ~[Ubooquity.jar:1.10.1]
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_60]
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[na:1.8.0_60]
   at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_60]
20160829 22:33:54 [pool-1-thread-27] ERROR com.ubooquity.Ubooquity - Uncaught exception on thread: pool-1-thread-27
java.lang.NoClassDefFoundError: Could not initialize class javax.imageio.ImageTypeSpecifier
   at com.sun.imageio.plugins.png.PNGImageReader.getImageTypes(PNGImageReader.java:1405) ~[na:1.8.0_60]
   at com.sun.imageio.plugins.png.PNGImageReader.readImage(PNGImageReader.java:1310) ~[na:1.8.0_60]
   at com.sun.imageio.plugins.png.PNGImageReader.read(PNGImageReader.java:1606) ~[na:1.8.0_60]
   at javax.imageio.ImageIO.read(ImageIO.java:1448) ~[na:1.8.0_60]
   at javax.imageio.ImageIO.read(ImageIO.java:1352) ~[na:1.8.0_60]
   at com.ubooquity.provider.theme.a.a(SourceFile:234) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.provider.theme.a.g(SourceFile:205) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.provider.comic.b.a(SourceFile:191) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c.a(SourceFile:324) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c.a(SourceFile:58) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.c$1.a(SourceFile:133) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e.a(SourceFile:287) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e$f.a(SourceFile:830) ~[Ubooquity.jar:1.10.1]
   at com.ubooquity.e.e$1$1.run(SourceFile:210) ~[Ubooquity.jar:1.10.1]
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_60]
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[na:1.8.0_60]

   at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_60]