2013-03-01 18:31:03,195 ERROR EventLoop:68 - Event handler [cz.winstrom.net.server.events.handlers.DoklFakMail@6190d003] failed

cz.winstrom.service.WSBusinessRTException: Too many open files in system
    at cz.winstrom.server.AbstractEvidenceHelper.generateIsdoc(AbstractEvidenceHelper.java:603)
    at cz.winstrom.server.DokladEvidenceHelper.sendEmail(DokladEvidenceHelper.java:375)
    at cz.winstrom.server.DokladEvidenceHelper.autoSendEmail(DokladEvidenceHelper.java:451)
    at cz.winstrom.net.server.events.handlers.DoklFakMail.handle(DoklFakMail.java:14)
    at cz.winstrom.net.server.events.EventLoop$EventHandlingTask.runHandler(EventLoop.java:94)
    at cz.winstrom.net.server.events.EventLoop$EventHandlingTask.run(EventLoop.java:66)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
    at java.lang.Thread.run(Thread.java:680)

Caused by: java.io.IOException: Too many open files in system
    at java.io.UnixFileSystem.createFileExclusively(Native Method)
    at java.io.File.createNewFile(File.java:883)
    at cz.winstrom.util.WSFileUtil.createTempFile(WSFileUtil.java:529)
    at cz.winstrom.server.AbstractEvidenceHelper.generateIsdoc(AbstractEvidenceHelper.java:577)
    ... 11 more

2013-03-01 18:31:03,340 ERROR NastaveniBLImpl:700 - javax.imageio.IIOException: Can't create cache file!