Twitter integration issue with ACAccountStore (iOS 5)

Question

When I run below code with iOS 6.0, Its working

ACAccountStore *account = [[ACAccountStore alloc] init];
ACAccountType *accountType = [account accountTypeWithAccountTypeIdentifier:ACAccountTypeIdentifierTwitter];

[account requestAccessToAccountsWithType:accountType options:nil
                                  completion:^(BOOL granted, NSError *error)
     {
         dispatch_async(dispatch_get_main_queue(), ^{

             if (granted) 
             {
                 //MY CODE
             }
         });

     }];

and When I run this code with iOS 5.0 or 5.1, It crashes with following output,

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', 
reason: '-[ACAccountStore requestAccessToAccountsWithType:options:completion:]: 
unrecognized selector sent to instance 0x68a57c0'

Don't know about this weird crash log..

Please tell me, How to get rid of this..

Answer 1

Use below method:

[account requestAccessToAccountsWithType:accountType withCompletionHandler:^(BOOL granted, NSError *error)
 {

   if (granted) {

            //Your code
            }
        }
   }];