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    <p>EDIT 1:</p> <p><strong>Your error is here:</strong></p> <pre><code> [self performSelectorOnMainThread:@selector(selector) ----------------------------------^^^^^^^^^^^^^^^^^^^ </code></pre> <p><code>selector</code> is already a selector, and your are putting it in <code>@selector(</code>) again.</p> <p>It should be </p> <pre><code> [self performSelectorOnMainThread:selector withObject:data waitUntilDone:YES]; </code></pre> <hr> <p>Edit 0:</p> <p>Your codes are correct. And you get the error only <strong>when your SEL method in not found in the current class</strong>.</p> <p>As in the code below, if I change the method name <code>sum</code> to <code>add</code> this will throw the same error.</p> <pre><code>-(void)sum{ NSLog(@"sum"); } -(void) createURL: (SEL) selector{ [self performSelector:selector]; } - (IBAction)total:(id)sender { SEL sel = NSSelectorFromString(@"sum"); [self createURL:sel]; } </code></pre> <hr> <p>Also, you need to meet the <strong>method signature</strong> as well. If your method takes one argument, You need to send exactly one.</p> <pre><code>-(void)sum:(id)integer{ NSLog(@"sum:%ld",[integer integerValue]); } -(void) createURL: (SEL) selector{ //NSData* data = [NSData dataWithContentsOfURL: nil]; //[self performSelectorOnMainThread:@selector(selector) withObject:data waitUntilDone:YES]; [self performSelector:selector withObject:@(12)]; } - (IBAction)total:(id)sender { NSInteger total=0; for (id element in self.arrayController.arrangedObjects) { total += [element firstNumber]*[element secondNumber]; } [self.label setStringValue:[NSString stringWithFormat:@"%ld",total]]; SEL sel = NSSelectorFromString(@"sum:"); [self createURL:sel]; } </code></pre>
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    1. POhow to create a method with a selector parameter
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    1. CObut it is all in the same class and I'm receiving the error message
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    2. COyour selector name is `nameOFmyMethodSelector:` so r u sure you passing a parameter too?
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    3. COIn other words, including a colon at the end means you are also passing a parameter. There is a difference between `nameOFmyMethodSelector:` and `nameOFmyMethodSelector`
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