[Solved] understanding ‘lldb’ backtace – app crashes when button is pressed

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This is your problem:

Foundation`-[NSObject(NSKeyValueCoding) setValue:forKey:]

because after this, is raised an Exception:

CoreFoundation`-[NSException raise] + 12

You are trying to set a value for a key in your object that could not exists or has some other problem.

P.S.: Update your answer with some relevant code so I can update my answer with more explanations.

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solved understanding ‘lldb’ backtace – app crashes when button is pressed