Ios 将视频上载到facebook时遇到异常

我正在尝试使用Social Framework将iPhone上的视频上传到用户的facebook时间线。我使用了中给出的代码片段。这是我的密码：

- (void)performActivity {
NSLog(@"sharing on facebook.");

ACAccountStore *accountStore = [[ACAccountStore alloc] init];

ACAccountType *facebookAccountType = [accountStore accountTypeWithAccountTypeIdentifier:ACAccountTypeIdentifierFacebook];

NSDictionary *options = @{ACFacebookAppIdKey : @"***", ACFacebookPermissionsKey : @[@"email"], ACFacebookAudienceKey:ACFacebookAudienceFriends};

[accountStore requestAccessToAccountsWithType:facebookAccountType options:options completion:^(BOOL granted, NSError *error) {
    if (granted) {

        NSDictionary *options = @{ACFacebookAppIdKey : @"***", ACFacebookPermissionsKey : @[@"publish_stream"], ACFacebookAudienceKey:ACFacebookAudienceFriends};

        [accountStore requestAccessToAccountsWithType:facebookAccountType options:options completion:^(BOOL granted, NSError *error) {
            if (granted) {
                NSLog(@"Publishing");
                ACAccount *fbAccount = [accountStore accountsWithAccountType:facebookAccountType][0];

                NSURL *videourl = [NSURL URLWithString:@"https://graph.facebook.com/me/videos"];

                NSURL *pathURL = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@session.mov", NSTemporaryDirectory()]];
                NSData *videoData = [NSData dataWithContentsOfFile:[NSString stringWithFormat:@"%@session.mov", NSTemporaryDirectory()]];
                NSDictionary *params = @{
                                         @"title": @"Nebuu",
                                         @"description": @"mebuu"
                                         };

                SLRequest *uploadRequest = [SLRequest requestForServiceType:SLServiceTypeFacebook
                                                              requestMethod:SLRequestMethodPOST
                                                                        URL:videourl
                                                                 parameters:params];
                [uploadRequest addMultipartData:videoData
                                       withName:@"source"
                                           type:@"video/quicktime"
                                       filename:@"Nebuu Video"];

                uploadRequest.account = fbAccount;

                [uploadRequest performRequestWithHandler:^(NSData *responseData, NSHTTPURLResponse *urlResponse, NSError *error) {
                    NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
                    if(error){
                        NSLog(@"Error %@", error.localizedDescription);
                    }else
                        NSLog(@"%@", responseString);
                }];
            }}];
    }}];
}

如你所见，我首先请求了阅读权限电子邮件，然后，如果第一个请求被批准，我请求了发布权限。代码工作正常，所有权限都被授予，应用程序开始上传视频。我可以在我的网络监控工具中看到这一点。但是，在上传视频后，我出现以下错误：

{
  "error": {
    "message": "An unexpected error has occurred. Please retry your request later.",
    "type": "OAuthException"
  }
}

这里可能有什么问题？我读了其他一些SO帖子，似乎有可能是Facebook方面的错误。有什么建议吗