[cbk1994]

"//#Clientside" should be all caps, not sure if it matters but it really ought to be.

getCategories looks like a serverside function so you have to trigger to the serverside part of the script, then trigger back to clientside.

In order to do player.getCategories, it would have to be in a class joined to the player. You would still have to use it serverside.

edit: skyld beat me to it