(com.facebook.sdk.login error 304.) Error with FBSDK 4.2

Question

I am trying to implement login with Facebook functionality, But I am getting following error in return.

Login Failed with error: The operation couldn’t be completed. (com.facebook.sdk.login error 304.)

Here is my Code

    - (void)loginWithFacebook {
        NSString *const read_actions = @"email";

        [[[FBSDKLoginManager alloc] init]
         logInWithReadPermissions:@[read_actions] handler:^(FBSDKLoginManagerLoginResult *result, NSError *error)
         {
             if (error) {
                 NSLog(@"Login Failed with error: %@", error.localizedDescription);
             }
             else if (result.isCancelled)
             {
                 NSLog(@"Login Failed due to Cancel");
             }
             else
             {
                 if ([result.grantedPermissions containsObject:read_actions]) {
                     NSLog(@"Permission granted");

                 }
             }
         }];
    }

Solution 1

It seems I was doing

[FBSDKAccessToken refreshCurrentAccessToken:^(FBSDKGraphRequestConnection *connection, id result, NSError *error){}

in a background thread during login operation. I removed that and It worked perfectly fine.

Solution 2

This may because of previous login token not cleared.So before login just logout.

NSString *const read_actions = @"email";
FBSDKLoginManager *loginManager = [[FBSDKLoginManager alloc] init];
[loginManager logOut];
[loginManager logInWithReadPermissions:@[read_actions]
                               handler:^(FBSDKLoginManagerLoginResult *result, NSError *error) {
                                   if (error) {
                                       NSLog(@"Login Failed with error: %@", error.localizedDescription);
                                   }
                                   else if (result.isCancelled) {
                                       NSLog(@"Login Failed due to Cancel");
                                   } else {
                                       if ([result.grantedPermissions containsObject:read_actions]) {
                                           NSLog(@"Permission granted");
                                        }
                                   }
                               }];

Solution 3

Swift 4 update :

Everytime you perform something like this

    FBSDKLoginManager().login(withReadPermission: ["email"], from: self) { (result, error) in  // Check for error and then login }

    //insert this code before the **Login code:** 
    FBSDKLoginManager().logOut()

and it should work fine :)

Solution 4

Log out the fblogin manager on action which you are performing login just before the login api like:-

fbLoginManager.logOut()
fbLoginManager.logIn(withReadPermissions: ["public_profile","email"], from: self) { (result, error) -> Void in 
    //Your code here
}

Solution 5

Swift 5 update :
Just refresh your accessToken or logout first.

func loginButtonClicked() {
            let loginManager = LoginManager()
            loginManager.logOut()
            loginManager.logIn(permissions: [.email], viewController: nil) { (loginResult) in
                switch loginResult {
                case .success(let grantedPermissions, _, let token):
                    self.returnUserData()
                    print("Success",token,grantedPermissions)
                    break
                case .cancelled:

                    print("Cancel")
                    break
                case .failed(let error):

                    print(error.localizedDescription)
                    break
                }
            }


        }

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