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

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java.lang.NullPointerException:
at weblogic.utils.enumerations.FileEnumeration.getNextFile(FileEnumeration.java:155)
at weblogic.utils.enumerations.FileEnumeration.hasMoreFiles(FileEnumeration.java:102)
at weblogic.utils.enumerations.FileEnumeration.hasMoreElements(FileEnumeration.java:134)
at weblogic.utils.jars.VirtualJarFile$2.hasNext(VirtualJarFile.java:112)
at weblogic.ejb20.deployer.EJBDeployer.makeFileHash(EJBDeployer.java:551)
at weblogic.ejb20.deployer.EJBDeployer.compileEJB(EJBDeployer.java:760)
at weblogic.ejb20.deployer.EJBDeployer.prepare(EJBDeployer.java:1242)
at weblogic.ejb20.deployer.EJBModule.prepare(EJBModule.java:242)
at weblogic.j2ee.J2EEApplicationContainer.prepareModule(J2EEApplicationContainer.java:1504)
at weblogic.j2ee.J2EEApplicationContainer.prepare(J2EEApplicationContainer.java:690)
at weblogic.j2ee.J2EEApplicationContainer.prepare(J2EEApplicationContainer.java:576)
at weblogic.management.deploy.slave.SlaveDeployer.processPrepareTask(SlaveDeployer.java:1064)
at weblogic.management.deploy.slave.SlaveDeployer.prepareUpdate(SlaveDeployer.java:732)
at weblogic.drs.internal.SlaveCallbackHandler$1.execute(SlaveCallbackHandler.java:24)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:153)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:134)

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