在做要用到Core Data 相关的项目，突然出现错误
"NSInternalInconsistencyException', reason: 'This NSPersistentStoreCoordinator has no persistent stores. It cannot perform a save operation.'""NSInternalIncons
阅读背景：
"NSInternalInconsistencyException', reason: 'This NSPersistentStoreCoordinator has no persistent stores. It cannot perform a save operation.'"
来源：互联网
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