hudson 1.335 (latest pmd-plugin and pmd v4.2.5 via anttask)

when I like to watch the source:

01 hudson.util.IOException2: remote file operation failed
02 at hudson.FilePath.act(FilePath.java:677)
03 at hudson.FilePath.act(FilePath.java:665)
04 at hudson.FilePath.copyTo(FilePath.java:1288)
05 at
hudson.plugins.pmd.util.HealthAwarePublisher.copyFilesWithAnnotationsToBuildFolder(HealthAwarePublisher.java:187)
06 at
hudson.plugins.pmd.util.HealthAwarePublisher.perform(HealthAwarePublisher.java:144)
07 at hudson.tasks.BuildStepMonitor$3.perform(BuildStepMonitor.java:36)
08 at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:541)
09 at
hudson.model.AbstractBuild$AbstractRunner.performAllBuildStep(AbstractBuild.java:527)
10 at
hudson.model.AbstractBuild$AbstractRunner.performAllBuildStep(AbstractBuild.java:515)
11 at hudson.model.Build$RunnerImpl.post2(Build.java:152)
12 at hudson.model.AbstractBuild$AbstractRunner.post(AbstractBuild.java:499)
13 at hudson.model.Run.run(Run.java:1199)
14 at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
15 at hudson.model.ResourceController.execute(ResourceController.java:88)
16 at hudson.model.Executor.run(Executor.java:123)
17 Caused by: java.io.FileNotFoundException:
de/nix/conditions/ConditionChecker.java (No such file or directory)
18 at java.io.FileInputStream.open(Native Method)
19 at java.io.FileInputStream.<init>(FileInputStream.java:106)
20 at hudson.FilePath$30.invoke(FilePath.java:1292)
21 at hudson.FilePath$30.invoke(FilePath.java:1288)
22 at hudson.FilePath$FileCallableWrapper.call(FilePath.java:2068)
23 at hudson.remoting.LocalChannel.call(LocalChannel.java:45)
24 at hudson.FilePath.act(FilePath.java:672)
25 ... 14 more
26 Can't copy file from workspace to build folder:
workspace=de/nix/conditions/ConditionChecker.java, build
folder=/var/lib/hudson/jobs/de.nix.BaseService/builds/2009-11-25_17-52-02/workspace-files/be97c8be.tmp

why is it not found?