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

One of the values you're trying to insert is coming back nil, which means attributeDict does not contain either a "level" or "probability" key. The string should not be nil even if it's provided with nil arguments, they just display as (nil).

Answer 2

Your argument to addObject: is likely nil.

Test it:

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

Answer 3

I fixed it. I misspelled a variable name.