If you keep receiving an error when you connect to your DarkRP or related gamemode, It may be because CS:S isn't mounted correctly or not mounted at all.
Counter-Strike Source is not mounted!
Common symptoms: money and guns floating in the air
You need to mount CSS
DarkRP will not work without it
Read these pages:
To solve this problem, Login to your TCadmin panel using the username and password you were sent via email and locate to Configuration Files.
Open up Mount.cfg and remove the // infront of cstrike to mount it. Save the file and restart your server to solve this pesky error.