java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at hudson.plugins.tasks.WorkspaceScanner.invoke(WorkspaceScanner.java:56)
at hudson.plugins.tasks.WorkspaceScanner.invoke(WorkspaceScanner.java:20)
at hudson.remoting.UserRequest.perform(UserRequest.java:69)
at hudson.remoting.UserRequest.perform(UserRequest.java:23)
at hudson.remoting.Request$2.run(Request.java:178)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)

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