I have been searching Google and SO and cannot find what com.apple.accounts Error Code 8 means. I am attempting to use iOS 6 and the Facebook SDK.
I run this request;
  if (!_accountStore) _accountStore = [[ACAccountStore alloc] init];
ACAccountType *fbActType = [_accountStore accountTypeWithAccountTypeIdentifier:ACAccountTypeIdentifierFacebook];
NSDictionary *options = [[NSDictionary alloc] initWithObjectsAndKeys:
                         (NSString *)ACFacebookAppIdKey, @"###############",  
                         (NSString *)ACFacebookPermissionsKey, [NSArray arrayWithObject:@"email"],  
                         nil];
[_accountStore requestAccessToAccountsWithType:fbActType options:options completion:^(BOOL granted, NSError *error) {
                                            if (granted) {
                                                NSLog(@"Success");
                                                NSArray *accounts = [_accountStore accountsWithAccountType:fbActType];
                                                _facebookAccount = [accounts lastObject];                                                    
                                            } else {
                                                NSLog(@"ERR: %@",error);
                                                // Fail gracefully...
                                            }
        }
 ];
I get this error:
ERR: Error Domain=com.apple.accounts Code=8 "The operation couldn’t be completed. (com.apple.accounts error 8.)"
No matter what I do, granted never returns true. Any ideas would be very much appreciated. 
If I bypass the if(granted) and call this function:
- (void)me{
    NSLog(@"Home.m - (void)me");
    NSURL *meurl = [NSURL URLWithString:@"https://graph.facebook.com/me"];
    SLRequest *merequest = [SLRequest requestForServiceType:SLServiceTypeFacebook
                                              requestMethod:SLRequestMethodGET
                                                        URL:meurl
                                                 parameters:nil];
    merequest.account = _facebookAccount;
    [merequest performRequestWithHandler:^(NSData *responseData, NSHTTPURLResponse *urlResponse, NSError *error) {
        NSString *meDataString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
        NSLog(@"%@", meDataString);
    }];
Then I see this JSON that is returned by Facebook:
{"error":{"message":"An active access token must be used to query information about the current user.","type":"OAuthException","code":2500}}}
Update: So, the error means "The client's access info dictionary has incorrect or missing values." but I do not know what that means.