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Editorial Team
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Asked: 2026-05-26T14:05:33+00:00

After changing something, i can’t trace back, my app is crashing with the following

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After changing “something, i can’t trace back”, my app is crashing with the following error:

2011-10-29 15:31:50.842 UnblockMe[6900:f803] *** Terminating app due to uncaught exception 
'NSUnknownKeyException', reason: '[<UIApplication 0x6e551b0> setValue:forUndefinedKey:]: 
this class is not key value coding-compliant for the key goBackButton.'

Only 1 class references the “goBackButton”. I rebuilt the relationships to and from this button since (Yet the problem persists)

Other then this, project contains no errors or warnings. “Clean” did not seem to help. Removing app and reinstalling it on the simulator produced no results.

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1 Answer

  1. Editorial Team

    The strange thing about that error is it’s supposed to tell you what the affected object is. See this link where somebody has a similar problem. What that makes me think is you have an overreleased object. That results in a pointer to nonsense memory. When you try to send a selector to it, strange things can happen.

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