使用Eclipse Visual Editor插件报错,急！！

用VE插件创建Visual Classes时，提示下面错误。请高手解救！
Error trying to set new file into editor. 
Reason: java.lang.NullPointerException---------------------------
环境：
jdk1.5.0
Eclipse 3.4.0
emf-sdo-runtime-2.2.0
GEF-runtime-3.2
VE-SDK-1.2
---------------------------
查看log：!ENTRY org.eclipse.ve.java.core 4 0 2008-09-13 11:41:10.187
!MESSAGE Exception thrown.
!STACK 0
java.util.NoSuchElementException
at org.eclipse.emf.common.util.BasicEList$EIterator.doNext(BasicEList.java:1333)
at org.eclipse.emf.common.util.BasicEList$EIterator.next(BasicEList.java:1312)
at org.eclipse.jem.internal.util.emf.workbench.ProjectResourceSetImpl.getResource(ProjectResourceSetImpl.java:352)
at org.eclipse.jem.internal.beaninfo.adapters.BeaninfoNature$5.getResource(BeaninfoNature.java:233)
at org.eclipse.jem.internal.util.emf.workbench.ProjectResourceSetImpl.getResourceFromHandlers(ProjectResourceSetImpl.java:180)
at org.eclipse.jem.internal.util.emf.workbench.ProjectResourceSetImpl.delegatedGetResource(ProjectResourceSetImpl.java:71)
at org.eclipse.jem.internal.util.emf.workbench.ProjectResourceSetImpl.getResource(ProjectResourceSetImpl.java:405)
at org.eclipse.ve.internal.java.codegen.core.VEModelInstance.createComposition(VEModelInstance.java:92)
at org.eclipse.ve.internal.java.codegen.core.JavaSourceTranslator.reConnect(JavaSourceTranslator.java:1134)
at org.eclipse.ve.internal.java.codegen.core.JavaSourceTranslator.decodeDocument(JavaSourceTranslator.java:910)
at org.eclipse.ve.internal.java.codegen.core.JavaSourceTranslator.loadModel(JavaSourceTranslator.java:597)
at org.eclipse.ve.internal.java.codegen.editorpart.JavaVisualEditorPart$Setup.run(JavaVisualEditorPart.java:1978)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)