java.lang.NullPointerException: Cannot invoke method call() on null object
2016-02-11 16:26:25.378 	at org.codehaus.groovy.runtime.NullObject.invokeMethod(NullObject.java:77)
2016-02-11 16:26:25.378 	at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:45)
2016-02-11 16:26:25.378 	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:42)
2016-02-11 16:26:25.378 	at org.codehaus.groovy.runtime.callsite.NullCallSite.call(NullCallSite.java:32)
2016-02-11 16:26:25.378 	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:42)
2016-02-11 16:26:25.378 	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
2016-02-11 16:26:25.378 	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:112)
2016-02-11 16:26:25.378 	at generateTrigger$_run_closure1.doCall(generateTrigger.groovy:26)
2016-02-11 16:26:25.378 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
2016-02-11 16:26:25.378 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
2016-02-11 16:26:25.378 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
2016-02-11 16:26:25.378 	at java.lang.reflect.Method.invoke(Method.java:606)
2016-02-11 16:26:25.378 	at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)
2016-02-11 16:26:25.378 	at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:233)
2016-02-11 16:26:25.378 	at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:272)
2016-02-11 16:26:25.378 	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:903)
2016-02-11 16:26:25.378 	at groovy.lang.Closure.call(Closure.java:415)
2016-02-11 16:26:25.378 	at org.codehaus.groovy.runtime.DefaultGroovyMethods.callClosureForMapEntry(DefaultGroovyMethods.java:3653)
2016-02-11 16:26:25.378 	at org.codehaus.groovy.runtime.DefaultGroovyMethods.each(DefaultGroovyMethods.java:1408)
2016-02-11 16:26:25.378 	at org.codehaus.groovy.runtime.dgm$171.invoke(Unknown Source)
2016-02-11 16:26:25.378 	at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite$PojoMetaMethodSiteNoUnwrapNoCoerce.invoke(PojoMetaMethodSite.java:271)
2016-02-11 16:26:25.378 	at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite.call(PojoMetaMethodSite.java:53)
2016-02-11 16:26:25.378 	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:42)
2016-02-11 16:26:25.378 	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
2016-02-11 16:26:25.378 	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
2016-02-11 16:26:25.378 	at generateTrigger.run(generateTrigger.groovy:16)
2016-02-11 16:26:25.378 	at javaposse.jobdsl.dsl.DslScriptLoader.runDslEngineForParent(DslScriptLoader.java:75)
2016-02-11 16:26:25.378 	at javaposse.jobdsl.dsl.DslScriptLoader.runDslEngine(DslScriptLoader.java:132)
2016-02-11 16:26:25.378 	at javaposse.jobdsl.plugin.ExecuteDslScripts.perform(ExecuteDslScripts.java:220)
2016-02-11 16:26:25.378 	at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
2016-02-11 16:26:25.378 	at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:782)
2016-02-11 16:26:25.378 	at hudson.model.Build$BuildExecution.build(Build.java:205)
2016-02-11 16:26:25.378 	at hudson.model.Build$BuildExecution.doRun(Build.java:162)
2016-02-11 16:26:25.378 	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:534)
2016-02-11 16:26:25.378 	at hudson.model.Run.execute(Run.java:1738)
2016-02-11 16:26:25.378 	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
2016-02-11 16:26:25.378 	at hudson.model.ResourceController.execute(ResourceController.java:98)
2016-02-11 16:26:25.378 	at hudson.model.Executor.run(Executor.java:410)
2016-02-11 16:26:25.378 ERROR: Cannot invoke method call() on null object