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

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java.lang.NullPointerException:
at java.util.regex.Pattern.(Pattern.java:1132)
at java.util.regex.Pattern.compile(Pattern.java:823)
at hudson.plugins.xshell.XShellBuilder.perform(XShellBuilder.java:122)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:785)
at hudson.model.Build$BuildExecution.build(Build.java:199)
at hudson.model.Build$BuildExecution.doRun(Build.java:160)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:566)
at hudson.model.Run.execute(Run.java:1679)
at hudson.matrix.MatrixRun.run(MatrixRun.java:146)
at hudson.model.ResourceController.execute(ResourceController.java:88)

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