Classgeneratorwizard extension plugin - "cannot create node content" error

Hi,
I updated latest ESDK in jdev, I tried executing the "ClassGeneratorWizard" plugin from " Tools & right click project", in both the cases, after 3rd step ie. clicking "finish", i'm getting an error dialog saying "cannot create node content".
What can be the issue ?
About jdeveloper versions
1. jdev version 10.1.3.3.0.4157
2. windows xp sp2
3. java platform - 1.5.0_06

Seems like there is a slight problem with the following two lines :
JavaManager javaMgr = JavaManager.getJavaManager(prj);
SourceFile javaFile = javaMgr.getSourceFile(node.getURL());
in the createContent method of the realWizard class.
I'll let the developer know about it.

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