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

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java.lang.NullPointerException:
at org.python.pydev.debug.codecoverage.PyCodeCoverageView$ChooseAction.run(PyCodeCoverageView.java:253)
at org.python.pydev.utils.ProgressOperation.execute(ProgressOperation.java:40)
at org.eclipse.ui.actions.WorkspaceModifyOperation$1.run(WorkspaceModifyOperation.java:104)

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