Block UITableView not scrolling , when get Facebook Friend List - ios - ios

Question

I have implement a script to get list friends in my facebook include image, username....
But when it load to viewcontroller ( uitableview ) list friends has return but the tableview be block scrolling, please help
'- (void)getFriendsListWithCompleteBlock:(void (^)(NSArray *, NSString *))completed{
if (!FBSession.activeSession.isOpen)
{
NSLog(#"permissions::%#",FBSession.activeSession.permissions);
// if the session is closed, then we open it here, and establish a handler for state changes
[FBSession openActiveSessionWithReadPermissions:#[#"basic_info", #"user_friends"]
allowLoginUI:YES
completionHandler:^(FBSession *session,
FBSessionState state,
NSError *error) {
if (error)
{
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:#"Error"
message:error.localizedDescription
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil];
[alertView show];
}
else if (session.isOpen)
{
[self showWithStatus:#""];
FBRequest *friendRequest = [FBRequest requestForGraphPath:#"me/friends?fields=name,picture,gender"];
[friendRequest startWithCompletionHandler:^(FBRequestConnection *connection, id result, NSError *error) {
NSArray *data = [result objectForKey:#"data"];
NSMutableArray *friendsList = [[NSMutableArray alloc] init];
for (FBGraphObject<FBGraphUser> *friend in data)
{
//NSLog(#"friend:%#", friend);
NSDictionary *picture = [friend objectForKey:#"picture"];
NSDictionary *pictureData = [picture objectForKey:#"data"];
//NSLog(#"picture:%#", picture);
FBData *fb = [[FBData alloc]
initWithData:(NSString*)[friend objectForKey:#"name"]
userID:(NSInteger)[[friend objectForKey:#"id"] integerValue]
gender:(NSString*)[friend objectForKey:#"gender"]
photoURL:(NSString*)[pictureData objectForKey:#"url"]
photo:(UIImage*)nil
isPhotoDownloaded:(BOOL)NO];
[friendsList addObject:fb];
}
NSString *message;
if (friendsList.count <1) {
message = #"Not Founds";
}
[self dismissStatus];
dispatch_async(dispatch_get_main_queue(), ^{
if (completed) {
completed(friendsList,message);
}
});
}];
}
}];
}
}
'