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The program closes at Objective-c. Please help solve my problem. Error:

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSNull length]: unrecognized selector sent to instance 0x115289cf0'

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MAhipal Singh
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Mehmet can
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  • "-[NSNull length]" Somewhere you have an object which is `[NSNull null]` but you are doing `[myObject length]` on it which is not allowed (you may be thought it was a NSString object). You may not call it yourself (could be an hidden call), but you need to find which line exactly is causing the issue (use `NSLog()`, Breakpoints, etc.). Are you using JSON? Without that we can't help you. – Larme Sep 25 '17 at 14:17
  • Google "cocoa how to debug uncaught exception unrecognized selector sent to instance" – Willeke Sep 25 '17 at 14:48

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