Garrysmod troubleshooting:Missing shutdown function pid: 0
From Serenity Servers Support
When Garry's Mod updates, missing shutdown functions are a familliar sight. This error is caused by some changes in the bin files, that now needs to be replaced.
- Open TcAdmin and navigate to the file manager of your server.
- In there, mark and remove the bin folder, then enter the garrysmod folder and also remove the bin folder from in here.
- Now simply go back and run the steam update tool, and wait for it to complete before you restart.
NOTE: DO NOT REMOVE ANY OTHER FOLDERS, AS THEY MAY STORE IMPORTANT FILES!