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copied!<blockquote> <p>The error I get is as follows:</p> <pre><code>2009-10-13 17:13:51.708 MyApp[7467:20b] * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '* -[NSCFSet contactsButtonPressed:]: unrecognized selector sent to instance 0x4c27330' </code></pre> </blockquote> <p>You're probably under-retaining whatever controller object of yours is supposed to receive that action message. Add an NSLog call in the controller's <code>dealloc</code> method; you'll probably find that it gets deallocked before you expect it to.</p> <p>The question to ask then is what should own that controller. Then, make sure that all of the owners are retaining it.</p> <p>If you're holding the controller in a property, make sure that you actually use that property. A common mistake is to write <code>myController = theController</code>, which bypasses the property and assigns directly to the instance variable, instead of <code>self.myController = theController</code> (property access syntax, implicit accessor message) or <code>[self setMyController:theController]</code> (explicit message syntax).</p> <p>Also, if you've implemented your own accessors for the property (especially <code>setMyController:</code>), make sure your setter releases the old object and retains the new one. Of course, this is assuming you have a reason to implement your own accessor; normally, you should simply <code>@synthesize</code> the property and let the compiler write the accessor for you.</p>

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