Help with referencing number of elements from a FileListToArray

Having some trouble using _FileListToArray function.  

I have read the help file and I confirmed the first element [0] in the array is the number of files/folders in the array.  In my case that would be 3 files.  If I manually enter "3" in the "For $i = 2 to 3" then it works, however if I use "For $i = 2 to $aDocs[0]" or "For $i = 2 to $aDocs[0]-1" I can not get it to work.  I'm sure I am missing something simple.  I would just like to reference the number of items in the array list in my For statement.

This works...


but this doesn't...