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POFacebook tutorial add logout button but blank screen
 

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    <p>I'm very new to objective C. I followed the tutorial for integrating Facebook to iOS app and did nothing else. After I added the code for logout button stuff, I ran it and it gave me an error at line : <code>[self.viewController.view addSubview:logoutButton];</code> The error is "unrecognized selector sent to instance 0x6b6c550". I know this might be a stupid error but if anyone can point out where I'm wrong I would be very appreciated!</p> <pre><code>static NSString* kAppId = @"340105106048288"; // Method that gets called when the sign out button is clicked - (void)logoutButtonClicked { [facebook logout]; } - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions (NSDictionary *)launchOptions { UIButton *logoutButton = [UIButton buttonWithType:UIButtonTypeRoundedRect]; logoutButton.frame = CGRectMake(40, 40, 200, 40); [logoutButton setTitle:@"Log Out" forState:UIControlStateNormal]; [logoutButton addTarget:self action:@selector(logoutButtonClicked) forControlEvents:UIControlEventTouchUpInside]; [self.viewController.view addSubview:logoutButton]; facebook = [[Facebook alloc] initWithAppId:kAppId andDelegate:self]; NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults]; if ([defaults objectForKey:@"FBAccessTokenKey"] &amp;&amp; [defaults objectForKey:@"FBExpirationDateKey"]) { facebook.accessToken = [defaults objectForKey:@"FBAccessTokenKey"]; facebook.expirationDate = [defaults objectForKey:@"FBExpirationDateKey"]; } // This part, the authorize method will bring you to the authorization page if (![facebook isSessionValid]) [facebook authorize:nil]; return YES; } // Pre iOS 4.2 support - (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url { return [facebook handleOpenURL:url]; } // For iOS 4.2+ support - (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation { return [facebook handleOpenURL:url]; } // Save the user credential, specifically the access token and the expiration date to the user defaults - (void)fbDidLogin { NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; [defaults setObject:[facebook accessToken] forKey:@"FBAccessTokenKey"]; [defaults setObject:[facebook expirationDate] forKey:@"FBExpirationDateKey"]; [defaults synchronize]; } - (void) fbDidLogout { // Remove saved authorization information if it exists NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; if ([defaults objectForKey:@"FBAccessTokenKey"]) { [defaults removeObjectForKey:@"FBAccessTokenKey"]; [defaults removeObjectForKey:@"FBExpirationDateKey"]; [defaults synchronize]; } } </code></pre>
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