title: error in ASIFormDataRequest "_OBJC_CLASS_$_ASIFormDataRequest", referenced from:
body: <p>I am struggling in ASIFormDataRequest.</p>
  
  <p>I want to upload a photo on facebook in iphone so that I used a ASIFormDataRequest in my programming but it give me error like  <code>_OBJC_CLASS_$_ASIFormDataRequest</code>, referenced from:</p>
  
  <p>I don't understand its meaning and how can I handle it</p>
  
  <p>My code for uploading photo is as follows:</p>
  
  <pre><code>-(void)postphoto:(id)sender
   {
       UISegmentedControl* _segControl;    
       //ASIFormDataRequest *request;
  
       UIImageView *_imageView = [UIImageView alloc];// initWithImage: image];
       NSString *likeString;
       NSString *filePath = nil;
       if (_imageView.image == [UIImage imageNamed:@"angelina.jpg"]) {
           filePath = [[NSBundle mainBundle] pathForResource:@"angelina" ofType:@"jpg"];
           likeString = @"babe";
       } else if (_imageView.image == [UIImage imageNamed:@"depp.jpg"]) {
           filePath = [[NSBundle mainBundle] pathForResource:@"depp" ofType:@"jpg"];
           likeString = @"dude";
       } else if (_imageView.image == [UIImage imageNamed:@"maltese.jpg"]) {
           filePath = [[NSBundle mainBundle] pathForResource:@"maltese" ofType:@"jpg"];
           likeString = @"puppy";
       }
       if (filePath == nil) return;
  
       NSString *adjectiveString;
       if (_segControl.selectedSegmentIndex == 0) {
           adjectiveString = @"cute";
       } else {
           adjectiveString = @"ugly";
       }
  
       NSString *message = [NSString stringWithFormat:@"I think this is a %@ %@!", adjectiveString, likeString];
  
       NSURL *url = [NSURL URLWithString:@"https://graph.facebook.com/me/photos"];
      //[ self setRequest:[ASIFormDataRequest requestWithURL:url]];
       request = [ASIFormDataRequest requestWithURL:url];
       [request addFile:filePath forKey:@"file"];
       [request setPostValue:message forKey:@"message"];
       //[request setPostValue:_accessToken forKey:@"access_token"];
       [request setDidFinishSelector:@selector(sendToPhotosFinished:)];
  
       [request setDelegate:self];
       [request startAsynchronous];
  
   }
  </code></pre>
  
  <p>I also added two files <code>ASIHTTPRequest.h</code> and <code>ASIFormDataRequest.h</code> and imported it where I written my code</p>
  
  <p>I have also added frameworks like <code>CFNetwork</code>,<code>Foundation</code>,etc </p>
  
  <p>Please help me in solving this error. </p>