Чтение документов помогает, реализовано следующее для решения моей проблемы:
- (void) requestFailed:(NSString *)connectionIdentifier withError: (NSError *) error; {
NSLog(@"Status Update Failed");
NSLog(@"Error: %@", error);
[loadingActionSheet dismissWithClickedButtonIndex:0 animated:YES];
[loadingActionSheet release];
alert = [[UIAlertView alloc]
initWithTitle:@"Error" message:@"Twitter did not receive your update, please try again later." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
[alert release];
}