i've a problem with the open tasks plugin if the build was build on slaves.
The operating system is Windows on both master and slave. The slave is started
via JNLP agent.

This show me the hudson console output view.

java.lang.NullPointerException
at
hudson.plugins.tasks.WorkspaceScanner.invoke(WorkspaceScanner.java:63)
at
hudson.plugins.tasks.WorkspaceScanner.invoke(WorkspaceScanner.java:23)
at hudson.FilePath$FileCallableWrapper.call(FilePath.java:997)
at hudson.remoting.UserRequest.perform(UserRequest.java:69)
at hudson.remoting.UserRequest.perform(UserRequest.java:23)
at hudson.remoting.Request$2.run(Request.java:200)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown
Source)
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown
Source)
at java.lang.Thread.run(Unknown Source)