Make sure you're trying the svn zip file.
You don't have to know how to code.
Open the only .lua file in a text editor.
Find where it says CATEGORY_NAME and change it to anything you want in quotes.
I recommend "Utility"
After doing that, if it doesn't work, then it's due to the fact this was released in December 2009.
There have been (virtually) countless number of updates to Gmod, ULX, and ULib since then.
Try PMing the original author, cause he's not been here since 2011, and would most likely not see any errors you post.