The operation couldn’t be completed. (com.facebook

问题:

Hi i am ussing ios6 for facebook login and i am getting this error as native popup

The operation couldn’t be completed. (com.facebook.sdk error 2.)

This is the scenario ive used. (I am running this on simularor)

I have logged in to the facebook app through settings and i tried to login to my app and its working fine.

Then i logged out of the facebook from settings and logged in again with different user. Then i tried to login to the app. I am getting this error.

I tried loging out of the app using the command

[FBSession.activeSession closeAndClearTokenInformation];

But no use.

The bundle identifier in the facebook app is same as in my ios app.

this is the code i used to login

NSArray *permissions = [[NSArray alloc] initWithObjects:@"email", nil];
    [FBSession openActiveSessionWithReadPermissions:permissions
                                       allowLoginUI:YES
                                  completionHandler:
     ^(FBSession *session,
       FBSessionState state, NSError *error) {
         [self sessionStateChanged:session state:state error:error];
     }];

Any help is appreciated.

This is the error i am getting

Domain=com.facebook.sdk Code=2 "The operation couldn’t be completed. (com.facebook.sdk error 2.)" UserInfo=0x9535330 {com.facebook.sdk:ErrorLoginFailedReason=com.facebook.sdk:SystemLoginDisallowedWithoutError, com.facebook.sdk:ErrorSessionKey=, expirationDate: (null), refreshDate: (null), attemptedRefreshDate: 0001-12-30 00:00:00 +0000, permissions:(null)>}

NOTE I got the same error on a different occation. At that time it was a bug in my code

Instead of giving permission as

NSArray *permissions = [[NSArray alloc] initWithObjects:@"email",@"birthday", nil];

i was wrongly doing it as

NSArray *permissions = [[NSArray alloc] initWithObjects:@"email,birthday", nil];

SOLUTION Even after correcting the code, I was getting the same error. I have to logout and login the facebook from ios settings screen. Once i did that the correct code never caused any problem. Note that the problem only occured on the device that previously executed the buggy code. Note sure what caused the problem, Hope this info helps someone

回答1:

This worked for me:

• Go to the settings app of your iPhone.
• Open your Facebook Settings
• Scroll down to your app and make sure your app allows facebook interaction.

This could happen on any device, therefore in your app you will have to make sure to handle this error correctly. I reckon you give the user feedback why Login With Facebook failed and ask the user to check their Facebook settings on their device.

 - (void)facebookSessionStateChanged:(FBSession *)session state:(FBSessionState)state error:(NSError *)error
{
    switch (state) {
        case FBSessionStateOpen:
            // handle successful login here
        case FBSessionStateClosed:
        case FBSessionStateClosedLoginFailed:
            [FBSession.activeSession closeAndClearTokenInformation];

            if (error) {
                // handle error here, for example by showing an alert to the user
                UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Could not login with Facebook"
                                                                message:@"Facebook login failed. Please check your Facebook settings on your phone."
                                                               delegate:nil
                                                      cancelButtonTitle:@"OK"
                                                  otherButtonTitles:nil];
                [alert show];
            }
            break;
        default:
            break;
    }

回答2:

check your Bundle identifier for your project and you give Bundle identifier for your app which create on developer.facebook.com that they are same or not.

回答3:

Another potential cause for this error: Attempting to get permission for a Facebook app in sandbox mode when the Facebook user is not listed in the app's admins, developers or testers.

回答4:

I solve my problem by passing nil permission while login.

[FBSession openActiveSessionWithReadPermissions:nil
                                       allowLoginUI:YES
                                  completionHandler:

回答5:

I had a similar issue. the error comes up when the i switched the fb user from setting. Facebook authorization fails on iOS6 when switching FB account on device This solved my problem

回答6:

I had the same issue and took a whole day to figure out the problem. This error message by Facebook SDK is very vague. I had this problem due to openURL: method being overwritten in MyApplication. I removed the overwritten method and facebook login worked fine.

回答7:

For me the problem was invalid permissions - I was requesting "birthday" instead of "user_birthday". It's a shame the error message isn't at least minimally descriptive - just saying "permissions invalid" rather than ERROR CODE 2 would have saved me so much time.