PDF books give java exeption

When I try to read a PDF ebook, the log file shows the following error:

20190526 16:00:49 [qtp1670546046-96] ERROR com.ubooquity.c.a - Could not serve stream with URI: /bookreader/21
org.eclipse.jetty.io.EofException: null
  at org.eclipse.jetty.io.ChannelEndPoint.flush(ChannelEndPoint.java:292)
~[jetty-io-9.4.0.v20161208.jar.8258200143543668761.tmp:9.4.0.v20161208]
  at org.eclipse.jetty.io.WriteFlusher.flush(WriteFlusher.java:429)
~[jetty-io-9.4.0.v20161208.jar.8258200143543668761.tmp:9.4.0.v20161208]
  at org.eclipse.jetty.io.WriteFlusher.write(WriteFlusher.java:322)
~[jetty-io-9.4.0.v20161208.jar.8258200143543668761.tmp:9.4.0.v20161208]
  at org.eclipse.jetty.io.AbstractEndPoint.write(AbstractEndPoint.java:372)
~[jetty-io-9.4.0.v20161208.jar.8258200143543668761.tmp:9.4.0.v20161208]
  at org.eclipse.jetty.server.HttpConnection$SendCallback.process(HttpConnection.java:741)
~[jetty-server-9.4.0.v20161208.jar.125194739452847055.tmp:9.4.0.v20161208]
  at org.eclipse.jetty.util.IteratingCallback.processing(IteratingCallback.java:241)
~[jetty-util-9.4.0.v20161208.jar.202814073141207242.tmp:9.4.0.v20161208]
  at org.eclipse.jetty.util.IteratingCallback.iterate(IteratingCallback.java:224)
~[jetty-util-9.4.0.v20161208.jar.202814073141207242.tmp:9.4.0.v20161208]
  at org.eclipse.jetty.server.HttpConnection.send(HttpConnection.java:518)
[jetty-server-9.4.0.v20161208.jar.125194739452847055.tmp:9.4.0.v20161208]
  at org.eclipse.jetty.server.HttpChannel.sendResponse(HttpChannel.java:677)
[jetty-server-9.4.0.v20161208.jar.125194739452847055.tmp:9.4.0.v20161208]
  at org.eclipse.jetty.server.HttpChannel.write(HttpChannel.java:728)
[jetty-server-9.4.0.v20161208.jar.125194739452847055.tmp:9.4.0.v20161208]
  at org.eclipse.jetty.server.HttpOutput.write(HttpOutput.java:234)
~[jetty-server-9.4.0.v20161208.jar.125194739452847055.tmp:9.4.0.v20161208]
  at org.eclipse.jetty.server.HttpOutput.write(HttpOutput.java:218)
~[jetty-server-9.4.0.v20161208.jar.125194739452847055.tmp:9.4.0.v20161208]
  at org.eclipse.jetty.server.HttpOutput.write(HttpOutput.java:509)
~[jetty-server-9.4.0.v20161208.jar.125194739452847055.tmp:9.4.0.v20161208]
   at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:2147) ~[commons-io-2.5.jar.6363128418599582580.tmp:2.5]
   at org.apache.commons.io.IOUtils.copy(IOUtils.java:2102) ~[commons-io-2.5.jar.6363128418599582580.tmp:2.5]
   at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:2123) ~[commons-io-2.5.jar.6363128418599582580.tmp:2.5]
   at org.apache.commons.io.IOUtils.copy(IOUtils.java:2078) ~[commons-io-2.5.jar.6363128418599582580.tmp:2.5]
   at com.ubooquity.d.d.a(SourceFile:96) ~[Ubooquity.jar:2.1.2]
   at com.ubooquity.c.a.a(SourceFile:374) [Ubooquity.jar:2.1.2]
   at com.ubooquity.provider.page.a.a(SourceFile:138) [Ubooquity.jar:2.1.2]
   at com.ubooquity.provider.page.a.a(SourceFile:78) [Ubooquity.jar:2.1.2]
   at com.ubooquity.d.c.a(SourceFile:142) [Ubooquity.jar:2.1.2]
   at com.ubooquity.d.b.handle(SourceFile:54) [Ubooquity.jar:2.1.2]
  at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
[jetty-server-9.4.0.v20161208.jar.125194739452847055.tmp:9.4.0.v20161208]
  at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:190)
[jetty-server-9.4.0.v20161208.jar.125194739452847055.tmp:9.4.0.v20161208]
  at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1228)
[jetty-server-9.4.0.v20161208.jar.125194739452847055.tmp:9.4.0.v20161208]
  at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:170)
[jetty-server-9.4.0.v20161208.jar.125194739452847055.tmp:9.4.0.v20161208]
  at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1130)
[jetty-server-9.4.0.v20161208.jar.125194739452847055.tmp:9.4.0.v20161208]
  at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
[jetty-server-9.4.0.v20161208.jar.125194739452847055.tmp:9.4.0.v20161208]
  at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:118)
[jetty-server-9.4.0.v20161208.jar.125194739452847055.tmp:9.4.0.v20161208]
  at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
[jetty-server-9.4.0.v20161208.jar.125194739452847055.tmp:9.4.0.v20161208]
  at org.eclipse.jetty.server.Server.handle(Server.java:564)
[jetty-server-9.4.0.v20161208.jar.125194739452847055.tmp:9.4.0.v20161208]
    at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:318)
[jetty-server-9.4.0.v20161208.jar.125194739452847055.tmp:9.4.0.v20161208]
  at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251)
[jetty-server-9.4.0.v20161208.jar.125194739452847055.tmp:9.4.0.v20161208]
  at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:279)
[jetty-io-9.4.0.v20161208.jar.8258200143543668761.tmp:9.4.0.v20161208]
  at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:112)
[jetty-io-9.4.0.v20161208.jar.8258200143543668761.tmp:9.4.0.v20161208]
  at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:124)
[jetty-io-9.4.0.v20161208.jar.8258200143543668761.tmp:9.4.0.v20161208]
  at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:672)
[jetty-util-9.4.0.v20161208.jar.202814073141207242.tmp:9.4.0.v20161208]
  at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:590)
[jetty-util-9.4.0.v20161208.jar.202814073141207242.tmp:9.4.0.v20161208]
   at java.lang.Thread.run(Thread.java:748) [na:1.8.0_212]
Caused by: java.io.IOException: Broken pipe
   at sun.nio.ch.FileDispatcherImpl.writev0(Native Method) ~[na:1.8.0_212]
   at sun.nio.ch.SocketDispatcher.writev(SocketDispatcher.java:51) ~[na:1.8.0_212]
   at sun.nio.ch.IOUtil.write(IOUtil.java:148) ~[na:1.8.0_212]
   at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:504) ~[na:1.8.0_212]
   at org.eclipse.jetty.io.ChannelEndPoint.flush(ChannelEndPoint.java:272)

~[jetty-io-9.4.0.v20161208.jar.8258200143543668761.tmp:9.4.0.v20161208]
... 39 common frames omitted

Is there a way I can fix this? epub books are working fine. I also tried to change the PDF compability but that didn't help.

I'm running version 2.1.2 on a armbian.