title: Method with completion handler
body: <p>I've created a method in a class:</p>
  
  <pre><code>- (void)getTableData:(NSString *)URL withCompletionHandler:(void (^)(NSString *))handler{
  
  __block NSDictionary *JSON;
  [manager POST:urlString parameters:jsonDict success:^(AFHTTPRequestOperation *operation, id responseObject){
  
      JSON = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingAllowFragments error:&amp;error];
      handler(JSON);
  }
        failure:^(AFHTTPRequestOperation *operation, NSError *error) {
            NSLog(@"error %@",error);
            // handle failure
        }];
  }
  </code></pre>
  
  <p>and call it in another class by</p>
  
  <pre><code>[ObjOfSecondClass getTableData:BILL withCompletionHandler:^(NSString* returnString)handler{
      }];
  </code></pre>
  
  <p>It shows Expected expression error at handler.</p>