error in javascript writer

i had created on alerting channel for queued messages in version 3.1.1.7461 it is working fine but i am using the same havascript in version 3.0.0.6936 but iam getting this error.

can anyone please help me with the following error.

Quote:

[2015-02-20 11:13:03,465] ERROR (com.mirth.connect.connectors.js.JavaScriptDispatc her:172): Error evaluating JavaScript Writer (JavaScript Writer "Inbound" on channel 5ab183a8-3b57-49ba-a3e8-3ae82ffcd3aa). com.mirth.connect.server.MirthJavascriptTransforme rException: CHANNEL: LIVE_Monitor_SamsClub_InboundCONNECTOR: InboundSCRIPT SOURCE: JavaScript WriterSOURCE CODE: 532: var timediff = curtime - lt;533: 534: channelMap.put('tdiff',timediff);535: 536: globalChannelMap.put('tq',cQ);537: globalChannelMap.put('te',cE);538: globalChannelMap.put('ts',cS);539: globalChannelMap.put('curtime',curtime);540: 541: LINE NUMBER: 537DETAILS: Wrapped java.lang.NullPointerException at e67cd0d9-7c7f-44fa-81e6-9015727fb069:537 (doScript) at e67cd0d9-7c7f-44fa-81e6-9015727fb069:661 at com.mirth.connect.connectors.js.JavaScriptDispatch er$JavaScriptDispatcherTask.call(JavaScriptDispatc her.java:163) at com.mirth.connect.connectors.js.JavaScriptDispatch er$JavaScriptDispatcherTask.call(JavaScriptDispatc her.java:102) at java.util.concurrent.FutureTask$Sync.innerRun(Unkn own Source) at java.util.concurrent.FutureTask.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor.runWorker( Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run (Unknown Source) at java.lang.Thread.run(Unknown Source)Caused by: java.lang.NullPointerException at java.util.concurrent.ConcurrentHashMap.put(Unknown Source) at com.mirth.connect.server.util.GlobalChannelVariabl eStore.put(GlobalChannelVariableStore.java:35) at sun.reflect.GeneratedMethodAccessor22.invoke(Unkno wn Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Un known Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.mozilla.javascript.MemberBox.invoke(MemberBox. java:126) at org.mozilla.javascript.NativeJavaMethod.call(Nativ eJavaMethod.java:225) at org.mozilla.javascript.Interpreter.interpretLoop(I nterpreter.java:1473) at org.mozilla.javascript.Interpreter.interpret(Inter preter.java:815) at org.mozilla.javascript.InterpretedFunction.call(In terpretedFunction.java:109) at org.mozilla.javascript.ContextFactory.doTopCall(Co ntextFactory.java:394) at org.mozilla.javascript.ScriptRuntime.doTopCall(Scr iptRuntime.java:3110) at org.mozilla.javascript.InterpretedFunction.exec(In terpretedFunction.java:120) at com.mirth.connect.server.util.javascript.JavaScrip tTask.executeScript(JavaScriptTask.java:49) at com.mirth.connect.connectors.js.JavaScriptDispatch er$JavaScriptDispatcherTask.call(JavaScriptDispatc her.java:128) ... 6 more

error in javascript writer