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java.lang.NullPointerException: 	at com.thortech.xl.installer.event.InstallScript.onExecutingPostInstallMessage(InstallScript.java:1919)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at com.installshield.event.ActionSequenceEngine$ActionTask.invokeJavaMethod(Unknown Source)	at com.installshield.event.ActionSequenceEngine$ActionTask.executeAction(Unknown Source)	at com.installshield.event.ActionSequenceEngine$ActionTask.run(Unknown Source)	at com.installshield.event.ThreadPool.run(Unknown Source)	at java.lang.Thread.run(Unknown Source)