[Espressomd-maintainer] Build failed in Jenkins: master-doc #521

[Jenkins Demon]

See <http://espressomd.org/jenkins/job/master-doc/521/>

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Failed to access build log

java.io.IOException: remote file operation failed: 
/scratch/jenkins/workspace/master-doc at address@hidden:cip14: 
hudson.remoting.ChannelClosedException: channel is already closed
        at hudson.FilePath.act(FilePath.java:986)
        at hudson.FilePath.act(FilePath.java:968)
        at hudson.FilePath.toURI(FilePath.java:1113)
        at hudson.tasks.MailSender.createFailureMail(MailSender.java:314)
        at hudson.tasks.MailSender.createMail(MailSender.java:180)
        at hudson.tasks.MailSender.run(MailSender.java:109)
        at hudson.tasks.Mailer.perform(Mailer.java:145)
        at 
hudson.tasks.BuildStepCompatibilityLayer.perform(BuildStepCompatibilityLayer.java:78)
        at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
        at 
hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:782)
        at 
hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:723)
        at hudson.model.Build$BuildExecution.post2(Build.java:185)
        at 
hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:668)
        at hudson.model.Run.execute(Run.java:1763)
        at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
        at hudson.model.ResourceController.execute(ResourceController.java:98)
        at hudson.model.Executor.run(Executor.java:410)
Caused by: hudson.remoting.ChannelClosedException: channel is already closed
        at hudson.remoting.Channel.send(Channel.java:578)
        at hudson.remoting.Request.call(Request.java:130)
        at hudson.remoting.Channel.call(Channel.java:780)
        at hudson.FilePath.act(FilePath.java:979)
        ... 16 more
Caused by: java.io.IOException
        at hudson.remoting.Channel.close(Channel.java:1163)
        at hudson.slaves.ChannelPinger$1.onDead(ChannelPinger.java:118)
        at hudson.remoting.PingThread.ping(PingThread.java:126)
        at hudson.remoting.PingThread.run(PingThread.java:85)
Caused by: java.util.concurrent.TimeoutException: Ping started at 1456800140899 
hasn't completed by 1456800380899
        ... 2 more