[The Geek]

You've got to be more specific on the errors for me to get a better idea.
From what I can guess, there are errors either copying the files GAS needs into gas/changes ... or there are problems making the file changes themselves (usually a result of previous modifications)

GAS copys all files that need changes to gas/changes and then tries to change them. Regardless if it was a goer or not, the files remain in gas/changes for you to manually move over after completion (a safety feature). Many people dont read the readme and leave the files there wondering why nothings working.
Another semi- common problem is that GAS cant copy the needed files into gas/changes. Not quite sure why, but its rare and an easy workaround.
Once you do the first step (creating file structure) and then the second (copying needed files) double check that the files are indeed in gas/changes
If not, then manually copy the files over before you go onto the final step. That always does the trick. The needed files (and this process) is outlined in the readme.

HTH's