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

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java.lang.NullPointerException:
at hudson.plugins.perforce.PerforceSCM.getLastChange(PerforceSCM.java:281)
at hudson.plugins.perforce.PerforceSCM.checkout(PerforceSCM.java:186)
at hudson.model.AbstractProject.checkout(AbstractProject.java:529)
at hudson.model.AbstractBuild$AbstractRunner.checkout(AbstractBuild.java:223)
at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:189)
at hudson.model.Run.run(Run.java:601)
at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:172)
at hudson.model.ResourceController.execute(ResourceController.java:70)
at hudson.model.Executor.run(Executor.java:62)

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