objective-c - 为什么这段代码给我错误：“程序中的意外@”？

Question

- (IBAction) createAccount: (id) sender {

NSString *post =[NSString stringWithFormat:@”name=%@&password=%@&email=%@”,nameField.text, passwordField.text, emailField.text];

NSString *hostStr = @”domain.tk/in-app/account/create-account.php?”;
hostStr = [hostStr stringByAppendingString:post];
NSData *dataURL =  [NSData dataWithContentsOfURL: [ NSURL URLWithString: hostStr ]];
NSString *serverOutput = [[NSString alloc] initWithData:dataURL encoding: NSASCIIStringEncoding];







if([serverOutput isEqualToString:@”Yes”]){


    UIAlertView *alertsuccess = [[UIAlertView alloc] initWithTitle:@”Congrats” message:@”Your account has bee succesfully created. “
                                                          delegate:self cancelButtonTitle:@”OK” otherButtonTitles:nil, nil];

    [alertsuccess show];
    [alertsuccess release];


} else {
    UIAlertView *alertsuccess = [[UIAlertView alloc] initWithTitle:@”Error” message:@”We are sorry, but an error has been encountered, please try agian later.”
                                                          delegate:self cancelButtonTitle:@”OK” otherButtonTitles:nil, nil];
    [alertsuccess show];
    [alertsuccess release];

}

}

我在几乎所有带有@ 的行上都收到错误，我该如何解决这个问题？我（想我）已经综合了我所有的字段，并在@interface 中做了 IBOutlet，并在@interface 下方给了它们@属性。我不知道如何解决这个问题，我错过了什么！

Answer 1