Facebook Login using Facebook SDK

Facebook Login using Facebook SDK

I used this concept to Login.
-(void)LoginButtonTapped {
NSArray *permissions = [[NSArray
alloc]initWithObjects:@"friends_email",@"user_birthday",@"user_hometown",@"user_location",@"friends_birthday",@"friends_location",@"friends_hometown",
nil];
[[delegate facebook]authorize:permissions];
[FBSession.activeSession openWithCompletionHandler:^(FBSession *session,
FBSessionState state,
NSError *error)
{
NSLog(@"success");
// [signinbutton setHidden:YES];
}
}];
[permissions release];
}
but,Suppose if i close the Login window without Login,then it does not
display Login Window again.
It showed Thread Error.
Any Idea Please help me.