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java.lang.NullPointerException: 	at hudson.maven.MavenModule.getAssignedLabel(MavenModule.java:185)	at hudson.model.Queue$Item.getWhy(Queue.java:591)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:585)	at org.apache.commons.jexl.util.PropertyExecutor.execute(PropertyExecutor.java:123)	at org.apache.commons.jexl.util.introspection.UberspectImpl$VelGetterImpl.invoke(UberspectImpl.java:311)	at org.apache.commons.jexl.parser.ASTArrayAccess.evaluateExpr(ASTArrayAccess.java:183)	at org.apache.commons.jexl.parser.ASTIdentifier.execute(ASTIdentifier.java:73)	at org.apache.commons.jexl.parser.ASTReference.execute(ASTReference.java:82)	at org.apache.commons.jexl.parser.ASTReference.value(ASTReference.java:56)	at org.apache.commons.jexl.parser.ASTReferenceExpression.value(ASTReferenceExpression.java:50)	at org.apache.commons.jexl.ExpressionImpl.evaluate(ExpressionImpl.java:79)	at org.apache.commons.jelly.expression.jexl.JexlExpression.evaluate(JexlExpression.java:69)	at org.apache.commons.jelly.expression.jexl.JexlExpressionFactory$ExpressionSupportLocal.evaluate(JexlExpressionFactory.java:122)	at org.apache.commons.jelly.impl.ExpressionScript.run(ExpressionScript.java:66)	at org.apache.commons.jelly.tags.define.InvokeBodyTag.doTag(InvokeBodyTag.java:91)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)	at org.apache.commons.jelly.impl.StaticTag.doTag(StaticTag.java:65)	at org.apache.commons.jelly.impl.StaticTagScript.run(StaticTagScript.java:112)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)	at org.apache.commons.jelly.tags.core.JellyTag.doTag(JellyTag.java:45)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)	at org.apache.commons.jelly.impl.DynamicTag.doTag(DynamicTag.java:80)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)	at org.apache.commons.jelly.impl.StaticTag.doTag(StaticTag.java:65)	at org.apache.commons.jelly.impl.StaticTagScript.run(StaticTagScript.java:112)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)	at org.apache.commons.jelly.impl.StaticTag.doTag(StaticTag.java:65)	at org.apache.commons.jelly.impl.StaticTagScript.run(StaticTagScript.java:112)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)	at org.apache.commons.jelly.tags.core.ForEachTag.doTag(ForEachTag.java:150)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)	at org.apache.commons.jelly.tags.core.OtherwiseTag.doTag(OtherwiseTag.java:41)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)	at org.apache.commons.jelly.tags.core.ChooseTag.doTag(ChooseTag.java:38)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.tags.define.InvokeBodyTag.doTag(InvokeBodyTag.java:91)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)	at org.apache.commons.jelly.impl.StaticTag.doTag(StaticTag.java:65)	at org.apache.commons.jelly.impl.StaticTagScript.run(StaticTagScript.java:112)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)	at org.apache.commons.jelly.tags.core.JellyTag.doTag(JellyTag.java:45)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)	at org.apache.commons.jelly.impl.DynamicTag.doTag(DynamicTag.java:80)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)	at org.apache.commons.jelly.tags.core.JellyTag.doTag(JellyTag.java:45)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)	at org.apache.commons.jelly.impl.DynamicTag.doTag(DynamicTag.java:80)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)	at org.apache.commons.jelly.tags.core.JellyTag.doTag(JellyTag.java:45)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)	at org.kohsuke.stapler.jelly.IncludeTag.doTag(IncludeTag.java:83)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.tags.define.InvokeBodyTag.doTag(InvokeBodyTag.java:91)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)	at org.apache.commons.jelly.tags.core.IfTag.doTag(IfTag.java:42)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)	at org.apache.commons.jelly.tags.core.JellyTag.doTag(JellyTag.java:45)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)	at org.apache.commons.jelly.impl.DynamicTag.doTag(DynamicTag.java:80)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)	at org.apache.commons.jelly.tags.core.JellyTag.doTag(JellyTag.java:45)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)	at org.kohsuke.stapler.jelly.IncludeTag.doTag(IncludeTag.java:83)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.tags.define.InvokeBodyTag.doTag(InvokeBodyTag.java:91)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)	at org.apache.commons.jelly.impl.StaticTag.doTag(StaticTag.java:65)	at org.apache.commons.jelly.impl.StaticTagScript.run(StaticTagScript.java:112)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)	at org.apache.commons.jelly.impl.StaticTag.doTag(StaticTag.java:65)	at org.apache.commons.jelly.impl.StaticTagScript.run(StaticTagScript.java:112)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)	at org.apache.commons.jelly.impl.StaticTag.doTag(StaticTag.java:65)	at org.apache.commons.jelly.impl.StaticTagScript.run(StaticTagScript.java:112)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)	at org.apache.commons.jelly.impl.StaticTag.doTag(StaticTag.java:65)	at org.apache.commons.jelly.impl.StaticTagScript.run(StaticTagScript.java:112)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)	at org.apache.commons.jelly.impl.StaticTag.doTag(StaticTag.java:65)	at org.apache.commons.jelly.impl.StaticTagScript.run(StaticTagScript.java:112)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)	at org.apache.commons.jelly.impl.StaticTag.doTag(StaticTag.java:65)	at org.apache.commons.jelly.impl.StaticTagScript.run(StaticTagScript.java:112)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)	at org.apache.commons.jelly.tags.core.JellyTag.doTag(JellyTag.java:45)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)	at org.apache.commons.jelly.impl.DynamicTag.doTag(DynamicTag.java:80)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:186)	at org.apache.commons.jelly.tags.core.JellyTag.doTag(JellyTag.java:45)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:262)	at org.kohsuke.stapler.jelly.JellyClassTearOff.invokeScript(JellyClassTearOff.java:68)	at org.kohsuke.stapler.jelly.JellyClassTearOff.serveIndexJelly(JellyClassTearOff.java:83)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:253)	at org.kohsuke.stapler.MetaClass$9.doDispatch(MetaClass.java:240)	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:30)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:270)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:207)	at org.kohsuke.stapler.Stapler.service(Stapler.java:72)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:210)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:870)	at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)	at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:685)	at java.lang.Thread.run(Thread.java:595)