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Editorial Team
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Asked: 2026-05-22T23:36:26+00:00

I’m getting the following error when I run my application in XCode: 2011-06-05 16:28:53.957

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I’m getting the following error when I run my application in XCode:

2011-06-05 16:28:53.957 QueryTesting[9452:707] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSCFString addObject:]: unrecognized selector sent to instance 0x170fd0'

The problem highlights the second line below:

NSString *facebookID = [NSString stringWithFormat:@"1222740351"];
[propertyValues addObject:facebookID];

Is there a problem with facebookID initializing?

EDIT:
propertyValues is a NSMutableArray and has been initialized here:

NSMutableArray *propertyValues = [[NSMutableString alloc] init];
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1 Answer

  1. Editorial Team

    propertyValues is defined as an NSString object but should be either an NSMutableArray object or NSMutableSet object, or any other object responding to an addObject:-message.

    Another possibility is mem corruption or you understood memory management wrong. In that case: read the memory management programming guide and enable the Clang Static Analyser!

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