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java.lang.NullPointerException: Cannot invoke method next() on null object	at org.codehaus.groovy.runtime.NullObject.invokeMethod(NullObject.java:77)	at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:45)	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)	at org.codehaus.groovy.runtime.callsite.NullCallSite.call(NullCallSite.java:32)	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:112)	at ConsoleScript18$_run_closure1.doCall(ConsoleScript18:3)	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:597)	at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)	at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:233)	at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:272)	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:909)	at groovy.lang.Closure.call(Closure.java:411)	at groovy.lang.Closure.call(Closure.java:427)	at org.codehaus.groovy.runtime.DefaultGroovyMethods.each(DefaultGroovyMethods.java:1325)	at org.codehaus.groovy.runtime.DefaultGroovyMethods.each(DefaultGroovyMethods.java:1297)	at org.codehaus.groovy.runtime.dgm$148.invoke(Unknown Source)	at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite$PojoMetaMethodSiteNoUnwrapNoCoerce.invoke(PojoMetaMethodSite.java:271)	at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite.call(PojoMetaMethodSite.java:53)	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)	at ConsoleScript18.run(ConsoleScript18:2)	at groovy.lang.GroovyShell.runScriptOrMainOrTestOrRunnable(GroovyShell.java:257)	at groovy.lang.GroovyShell.run(GroovyShell.java:481)	at groovy.lang.GroovyShell.run(GroovyShell.java:163)	at groovy.lang.GroovyShell$run.call(Unknown Source)	at groovy.ui.Console$_runScriptImpl_closure17.doCall(Console.groovy:951)	at groovy.ui.Console$_runScriptImpl_closure17.doCall(Console.groovy)	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:597)	at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)	at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:233)	at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:272)	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:909)	at groovy.lang.Closure.call(Closure.java:411)	at groovy.lang.Closure.call(Closure.java:405)	at groovy.lang.Closure.run(Closure.java:492)	at java.lang.Thread.run(Thread.java:662)