I used the program that automatically gets all L4D items into Gmod, and it worked fine. Then I joined a server which didn’t support the items, and when I tried to spawn one nothing would happen or an error would appear. I thought it would go back to normal on singleplayer, but it didn’t. I ran the program again and that didn’t do anything.
Should I delete all the items and then run the program again? And where would I go about finding these files so I can delete them?