zip file errors in the log files?

What does the following mean?

within a 2 minute window - the warning shows up 12 times -

the file either is or is not a zip file isn't it?

if the file is unreadable (which it seems to be... ) - shouldn't the error reflect that?

if the ISNOT a zip file - any indication as to what filetype it should be?

if it is a zip file then a scrambled multi-part zip.... zip vs. gzip vs. other flavors... (DOS/Mac/Linux/etc....)

more info please?!?!

20160314 01:09:29 [Scanner thread] WARN com.ubooquity.f.a - Failed to read file, will try to guess format: /mnt/Public/Comics/Marvel_Comics/Pre-Marvel(Timely-Atlas)/What's Scanned & Unscanned in the Timely-Atlas Universe (2010-07).cbz

20160314 01:09:29 [Scanner thread] INFO com.ubooquity.f.a - File type is in reality a ZIP (cbz)
20160314 01:09:29 [Scanner thread] WARN com.ubooquity.f.a - Could not open file: /mnt/Public/Comics/Marvel_Comics/Pre-Marvel(Timely-Atlas)/What's Scanned & Unscanned in the Timely-Atlas Universe (2010-07).cbz

java.util.zip.ZipException: archive is not a ZIP archive
   at org.apache.commons.compress.archivers.zip.ZipFile.positionAtEndOfCentralDirectoryRecord(ZipFile.java:806) ~[commons-compress-1.9.jar.7390313412389470896.tmp:1.9]
   at org.apache.commons.compress.archivers.zip.ZipFile.positionAtCentralDirectory(ZipFile.java:736) ~[commons-compress-1.9.jar.7390313412389470896.tmp:1.9]
   at org.apache.commons.compress.archivers.zip.ZipFile.populateFromCentralDirectory(ZipFile.java:481) ~[commons-compress-1.9.jar.7390313412389470896.tmp:1.9]
   at org.apache.commons.compress.archivers.zip.ZipFile.(ZipFile.java:216) ~[commons-compress-1.9.jar.7390313412389470896.tmp:1.9]

   at org.apache.commons.compress.archivers.zip.ZipFile.(ZipFile.java:192) ~[commons-compress-1.9.jar.7390313412389470896.tmp:1.9]
   at com.ubooquity.fileformat.cbz.a.a(SourceFile:40) ~[Ubooquity.jar:1.9.1]
   at com.ubooquity.f.a.a(SourceFile:89) [Ubooquity.jar:1.9.1]
   at com.ubooquity.f.a.a(SourceFile:30) [Ubooquity.jar:1.9.1]
   at com.ubooquity.b.c.a(SourceFile:66) [Ubooquity.jar:1.9.1]

   at com.ubooquity.data.feeder.a.b(SourceFile:512) [Ubooquity.jar:1.9.1]
   at com.ubooquity.data.feeder.a.c(SourceFile:470) [Ubooquity.jar:1.9.1]
   at com.ubooquity.data.feeder.a.b(SourceFile:35) [Ubooquity.jar:1.9.1]
   at com.ubooquity.data.feeder.a$1.run(SourceFile:123) [Ubooquity.jar:1.9.1]
   at java.lang.Thread.run(Thread.java:745) [na:1.8.0_60]