NSMutableArray released twice by release

Question

In didFinishLaunchingWithOptions, the first code is:

NSMutableArray *k = [[NSMutableArray alloc] initWithCapacity:10];
[k release];

(I reduced it to this case after much debugging) and I'm getting

*** -[__NSArrayM class]: message sent to deallocated instance 0x7576c90
*** -[__NSArrayM respondsToSelector:]: message sent to deallocated instance 0x7576c90

If I check the retainCount on 'k' after the alloc line, it is 1. If I replace NSMutableArray by NSArray everything is fine. What the heck is going on here??

Answer 1

That error must be coming from somewhere else. Which means you're using it. Else, you wouldn't have

*** -[__NSArrayM respondsToSelector:]: message sent to deallocated instance 0x7576c90

But something like :

*** -[__NSArrayM release]: message sent to deallocated instance 0x7576c90

Plus, you should not use retainCount (see why here).

Just check that you're not using it anywhere else. Or maybe you're using ARC ? In which case you don't need to release it.