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

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This exception has no message.
java.lang.NullPointerException:
at org.netbeans.modules.j2ee.deployment.config.ConfigSupportImpl.setCMPMappingInfo(ConfigSupportImpl.java:517)
at org.netbeans.modules.j2ee.ejbjarproject.ejb.wizard.cmp.RelatedCMPWizard.createBeans(RelatedCMPWizard.java:576)
at org.netbeans.modules.j2ee.ejbjarproject.ejb.wizard.cmp.RelatedCMPWizard.access$000(RelatedCMPWizard.java:83)
at org.netbeans.modules.j2ee.ejbjarproject.ejb.wizard.cmp.RelatedCMPWizard$1.run(RelatedCMPWizard.java:173)
at org.openide.util.Task.run(Task.java:189)
at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:330)
at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:721)

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