java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at oracle.ideimpl.log.TabbedLogManager.getMsgPage(TabbedLogManager.java:101)
at oracle.toplink.addin.log.POJOGenerationLoggingAdapter.updateTask(POJOGenerationLoggingAdapter.java:42)
at oracle.toplink.addin.mappingcreation.MappingCreatorImpl.fireTaskUpdated(MappingCreatorImpl.java:1102)
at oracle.toplink.addin.mappingcreation.MappingCreatorImpl.generateMappedDescriptorsForTables(MappingCreatorImpl.java:269)
at oracle.toplink.addin.mappingcreation.MappingCreatorImpl.generateMappedDescriptorsForTables(MappingCreatorImpl.java:206)
at oracle.toplink.addin.wizard.jobgeneration.JobWizard$1.construct(JobWizard.java:401)
at oracle.ide.util.SwingWorker$1.run(SwingWorker.java:119)
at java.lang.Thread.run(Thread.java:595)

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