let me start by showing my line of codes:

```
    local names = {}
    str = "Hello World"
    for count = 0, #str do
         names[count] = string.sub(str, count, count)
         names[count].id = count
    end

```

BTW, this is just a sample but my concept is there. Anyway, it keeps returning an error saying attempt to index field '?' (a nil value). What does this error mean? i tried using something like this in my other project it worked just fine. Except, it was an image, still why does it not apply to this instance? where does indexing apply to?