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what happens ?0 CoreFoundation 0x00000001d1b55294 + 252 1 libobjc.A.dylib 0x00000001d0d2f9f8 objc_exception_throw + 56 2 CoreData 0x00000001d4714694 + 0 3 CoreData 0x00000001d4714868 + 208 4 CoreData 0x00000001d4714af8 + 608 5 CoreData 0x00000001d45aad14 + 240 6 CoreData 0x00000001d45ab99c + 844 7 CoreData 0x00000001d45ab9c8 + 888 8 CoreData 0x00000001d45ac81c + 1592 9 XMPPFramework 0x00000001056d7920 -[XMPPCoreDataStorage save] + 304 10 XMPPFramework 0x00000001056d7e98 __37-[XMPPCoreDataStorage scheduleBlock:]_block_invoke + 76 11 libdispatch.dylib 0x00000001d1594a38 + 24 12 libdispatch.dylib 0x00000001d15957d4 + 16 13 libdispatch.dylib 0x00000001d1570dec + 548 14 libdispatch.dylib 0x00000001d157192c + 408 15 libdispatch.dylib 0x00000001d1579e08 + 584 16 libsystem_pthread.dylib 0x00000001d1775114 _pthread_wqthread + 304 17 libsystem_pthread.dylib 0x00000001d1777cd4 start_wqthread + 4

This NSPersistentStoreCoordinator has no persistent stores (I/O error). It cannot perform a save operation. (null) (( 0 CoreFoundation 0x000000022cbf1294 + 252 1 libobjc.A.dylib 0x000000022bdcb9f8 objc_exception_throw + 56 2 CoreData 0x000000022f7b0798 + 0 3 CoreData 0x000000022f7b0868 + 208 4 CoreData 0x000000022f7b0af8 + 608 5 CoreData 0x000000022f646d14 + 240 6 CoreData 0x000000022f64799c + 844 7 CoreData 0x000000022f6479c8 + 888 8 CoreData 0x000000022f64881c + 1592 9 XMPPFramework 0x00000001056bb920 -[XMPPCoreDataStorage save] + 304 10 XMPPFramework 0x00000001056bbe98 __37-[XMPPCoreDataStorage scheduleBlock:]_block_invoke + 76 11 libdispatch.dylib 0x000000022c630a38 + 24 12 libdispatch.dylib 0x000000022c6317d4 + 16 13 libdispatch.dylib 0x000000022c60cdec + 548 14 libdispatch.dylib 0x000000022c60d92c + 408 15 libdispatch.dylib 0x000000022c615e08 + 584 16 libsystem_pthread.dylib 0x000000022c811114 _pthread_wqthread + 304 17 libsystem_pthread.dylib 0x000000022c813cd4 start_wqthread + 4 )