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    <p>I ran into this error when trying to reference a protocol I had set up myself. </p> <p>This shows my protocol, the wrong method, and what I think is right method.</p> <pre><code>in .h // ------------------------------------ EtEmailDelegate Protocol -BEGIN- -------------------------------------- @protocol EtEmailDelegate - (void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error; //&lt;-- This is really just one chunk from the MFMailComposeViewControllerDelegate @end // ------------------------------------ EtEmailDelegate Protocol -END- -------------------------------------- @interface ClsEtEmail : NSObject &lt; MFMailComposeViewControllerDelegate&gt; { // owner UIViewController *myUivc; //EtEmailDelegate *myDelegate; // &lt;--- the wrong way, throw error id&lt;EtEmailDelegate&gt; *myDelegate; // &lt;-- the right way (i think) ... } @property (nonatomic, readwrite, assign) id&lt;EtEmailDelegate&gt; delegate; @end </code></pre> <hr> <p>Just for completeness, here is how I'm implementing some methods that also rely on the protocol...</p> <pre><code>in .m @synthesize delegate = myDelegate; // my static initializer +(id) objEtEmailWithUivc: (UIViewController*) theUivc delegate: (id &lt;EtEmailDelegate&gt;) theDelegate { ClsEtEmail * obj = [[[ClsEtEmail alloc] initWithlUivc: theUivc delegate:theDelegate] autorelease]; return obj; } // my normal init - (id)initWithlUivc: (UIViewController*) theUivc delegate: (id &lt;EtEmailDelegate&gt;) theDelegate { self = [super init]; if (self) { [self init_]; // my private init (not seen) self.uivc = theUivc; NSAssert([theDelegate conformsToProtocol:@protocol(EtEmailDelegate)],@"whoh - this can't is notE tEmailDelegate"); self.delegate = theDelegate; } return self; } </code></pre> <p>Hope this helps someone else.</p>
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