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java.lang.NullPointerException: 	at weblogic.store.io.file.StoreDir.findFiles(StoreDir.java:288)	at weblogic.store.io.file.StoreDir.open(StoreDir.java:73)	at weblogic.store.io.file.Heap.open(Heap.java:289)	at weblogic.store.io.file.FileStoreIO.open(FileStoreIO.java:104)	at weblogic.store.internal.PersistentStoreImpl.recoverStoreConnections(PersistentStoreImpl.java:431)	at weblogic.store.internal.PersistentStoreImpl.open(PersistentStoreImpl.java:422)	at weblogic.store.xa.PersistentStoreManagerXA.createFileStore(PersistentStoreManagerXA.java:117)	at weblogic.diagnostics.archive.DiagnosticStoreRepository.getStore(DiagnosticStoreRepository.java:91)	at weblogic.diagnostics.lifecycle.DiagnosticSystemService.start(DiagnosticSystemService.java:143)	at weblogic.t3.srvr.SubsystemRequest.run(SubsystemRequest.java:64)	at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)	at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)