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java.lang.NullPointerException: 	at java.util.regex.Pattern.(Pattern.java:1336)	at java.util.regex.Pattern.compile(Pattern.java:1022)	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:1677)	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)	at hudson.model.ResourceController.execute(ResourceController.java:88)	at hudson.model.Executor.run(Executor.java:230)