Object cannot be nil error

Question

I am getting an error when I try to add a new object to dataArray. This is how I define dataArray.

-(NSMutableArray *)dataArray{
    i         


        

Answer 1

Your argument to addObject: is likely nil.

Test it:

assert(attributeDict);
assert([attributeDict objectForKey:@"level"]);
assert([attributeDict objectForKey:@"probability"]);