title: cocos2d schedule selector error
body: <p>i have an error when scheduling a method. (to display how many star you get according to your score. i have addStar0 addStar1 addStar2 addStar3 methods)</p>
  
  <pre><code>[self schedule:@selector(addStar0) interval:0.2f];
  </code></pre>
  
  <p>and the methods are: </p>
  
  <pre><code>-(void) addstar0 {
      [self unschedule:_cmd];
  
      if (star &gt; starProgress) {
          starProgress++;
          [self schedule:@selector(addStar1) interval:0.5f];
      }
      else {
          [self schedule:@selector(displayResult) interval:0.5f];
      }
  
  }
  </code></pre>
  
  <p>error message: </p>
  
  <pre><code>Signature not found for selector - does it have the following form? -(void) name: (ccTime) dt
  </code></pre>
  
  <p>I've tried changing all my methods into addStar1: (ccTime) delta and schedule: @selector(addStar:) interval: 0.2f, but still the same. (actually i've used both ways to schedule( with/without parameter), and both of them worked well in my last project. )</p>
  
  <p>also, one weird thing: sometimes i can't use [self schedule: something], but [CCScheduler sharedScheduler] schedule: something] works fine. I guess it may be project settings or so? </p>
  
  <p>Please answer it with code. thank you. </p>