It’s always a good idea to post either the entire macro here, or if it doesn’t run outside of its context, a minimized (= reduced to the essential) version of the macro, which still reproduces the problem.
A “side” effect of minimizing a macro (or any piece of code) is that in the process of minimizing you’ll often catch the error already.
So I don’t know, what exactly you are doing for moving/renaming the file. The usual thing would be this:
If you are getting zero byte files it seems that somehow you managed to create a new file…
Are you sure that your variables are holding the correct paths?