this is a very accurate and concise error :)
see, you have, for instance

$vow++
[download]

but you never bother to print it out, or manipulate it in any fashion.
I imagine you'd want to put it into the "vow" bucket in your hash called count, and then print that out later, but I'm really just guessing there.
To sum up, you're getting this error message becuase you really are using these variables only once!

updated : corrected typeo