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核心数据示例,无效更新:第0节中的行数无效

我是iOS和XCode的新手,我正在通过核心数据教程,我真的很难过.我不断收到以下错误日志中的错误:

Exception Type:  EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Crashed Thread:  0  Dispatch queue: com.apple.main-thread

Application Specific Information:
iPhone Simulator 235, iPhone OS 4.2 (iPad/8C134)
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid update: invalid number of rows in section 0.  The number of rows contained in an existing section after the update (0) must be equal to the number of rows contained in that section before the update (0), plus or minus the number of rows inserted …
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core-data ipad ios

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