Build failed in Jenkins: isis-framework-windows #170

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See <https://builds.apache.org/job/isis-framework-windows/170/>

------------------------------------------
Started by timer
Building remotely on windows1
Cleaning up <https://builds.apache.org/job/isis-framework-windows/ws/framework>
Deleting 
<https://builds.apache.org/job/isis-framework-windows/ws/framework\target>
ERROR: Failed to update 
http://svn.apache.org/repos/asf/incubator/isis/trunk/framework
org.tmatesoft.svn.core.SVNException: svn: Unknown error
        at 
hudson.scm.subversion.UpdateWithCleanUpdater$TaskImpl$1.handleStatus(UpdateWithCleanUpdater.java:71)
        at 
org.tmatesoft.svn.core.internal.wc.SVNStatusEditor.sendUnversionedStatus(SVNStatusEditor.java:358)
        at 
org.tmatesoft.svn.core.internal.wc.SVNStatusEditor.getDirStatus(SVNStatusEditor.java:208)
        at 
org.tmatesoft.svn.core.internal.wc.SVNStatusEditor.closeEdit(SVNStatusEditor.java:114)
        at 
org.tmatesoft.svn.core.wc.SVNStatusClient.doStatus(SVNStatusClient.java:380)
        at 
hudson.scm.subversion.UpdateWithCleanUpdater$TaskImpl.preUpdate(UpdateWithCleanUpdater.java:59)
        at 
hudson.scm.subversion.UpdateUpdater$TaskImpl.perform(UpdateUpdater.java:127)
        at 
hudson.scm.subversion.WorkspaceUpdater$UpdateTask.delegateTo(WorkspaceUpdater.java:135)
        at hudson.scm.SubversionSCM$CheckOutTask.perform(SubversionSCM.java:726)
        at hudson.scm.SubversionSCM$CheckOutTask.invoke(SubversionSCM.java:707)
        at hudson.scm.SubversionSCM$CheckOutTask.invoke(SubversionSCM.java:691)
        at hudson.FilePath$FileCallableWrapper.call(FilePath.java:1979)
        at hudson.remoting.UserRequest.perform(UserRequest.java:118)
        at hudson.remoting.UserRequest.perform(UserRequest.java:48)
        at hudson.remoting.Request$2.run(Request.java:270)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
        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:886)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at hudson.remoting.Engine$1$1.run(Engine.java:60)
        at java.lang.Thread.run(Thread.java:619)
Caused by: java.io.IOException: Unable to delete file: 
<https://builds.apache.org/job/isis-framework-windows/ws/framework\target\supplemental-models.xml>
        at org.apache.commons.io.FileUtils.forceDelete(FileUtils.java:1390)
        at org.apache.commons.io.FileUtils.cleanDirectory(FileUtils.java:1044)
        at org.apache.commons.io.FileUtils.deleteDirectory(FileUtils.java:977)
        at 
hudson.scm.subversion.UpdateWithCleanUpdater$TaskImpl$1.handleStatus(UpdateWithCleanUpdater.java:67)
        ... 21 more
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