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java.lang.NullPointerException: 	at java.util.regex.Matcher.getTextLength(Matcher.java:1234)	at java.util.regex.Matcher.reset(Matcher.java:308)	at java.util.regex.Matcher.(Matcher.java:228)	at java.util.regex.Pattern.matcher(Pattern.java:1088)	at hudson.FilePath.normalize(FilePath.java:285)	at hudson.FilePath.(FilePath.java:230)	at org.jenkinsci.plugins.vagrant.VagrantWrapper.parseVagrantEnvironment(VagrantWrapper.java:107)	at org.jenkinsci.plugins.vagrant.VagrantWrapper.validate(VagrantWrapper.java:184)	at org.jenkinsci.plugins.vagrant.VagrantWrapper.executeCommand(VagrantWrapper.java:133)	at org.jenkinsci.plugins.vagrant.VagrantUpCommand.perform(VagrantUpCommand.java:101)	at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)	at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:770)	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:533)	at hudson.model.Run.execute(Run.java:1745)	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)	at hudson.model.ResourceController.execute(ResourceController.java:89)	at hudson.model.Executor.run(Executor.java:240)