Most likely what happened was that when you joined, the Steam Workshop Content you downloaded while joining got corrupted somehow. So to fix this, we're going to make Garry's Mod re-download YukiTheater's content. SteamApps will most likely be located in C:\Program Files (x86)\Steam or C:\Program Files\Steam, unless you installed Steam to a different drive. Method 1 Follow these steps in order: Exit Garry's Mod Go to SteamApps/common/GarrysMod/garrysmod/downloads/server Delete the following files from the server folder: 364036300.gma -- Map Content 364037241.gma -- Map Content 2 364037278.gma -- Map Content 3 159197754.gma -- Content One 217746861.gma -- Content Two 281301169.gma -- Content Three 317955588.gma -- Content Four 317969764.gma -- Content Five 456628911.gma -- Content Six 456627726.gma -- Content Seven 527651958.gma -- Content Eight 829731410.gma -- Content Nine 207720619.gma -- Holiday Content 544440704.gma -- Holiday Map Content 544437985.gma -- Holiday Map Content 2 Start Garry's Mod again and attempt to join the server Your issue should now be fixed, but if it isn't, carefully reread the instructions and try again. If it still doesn't work after trying again, go to Method 2. Method 2 If you Are Subscribed to YukiTheater's Workshop Content, follow these steps in order: Exit Garry's Mod Unsubscribe from all of YukiTheater's Workshop Content Go to SteamApps/common/GarrysMod/garrysmod/addons Delete anything in the addons folder with "yukitheater" in the filename Perform Method 1 again. Start Garry's Mod again and attempt to join the server If you Are Not Subscribed to YukiTheater's Workshop Content, follow these steps in order: Exit Garry's Mod Subscribe to all of YukiTheater's Workshop Content Start Garry's Mod again Wait for all of YukiTheater's Workshop Content to finish downloading (the Workshop notification should no longer appear at the bottom) Exit Garry's Mod, start it again, and attempt to join the server If neither of these methods work, simply reply to this thread and I'll try my best to assist you.