Couldnt chage to active gamemode (HELP)

Hello, am currently trying to setup a Gmod Racer server and when i drag the gamemode folder (gmodracer) into gamemodes folder and add +gamemode gmodracer in the startup it says “Couldn’t change active gamemode - ‘gmodracer’ not found”

Really need help!

[editline]17th December 2016[/editline]

Link to gamemode: https://garrysmods.org/download/16437/gmodracer-no-mysql-db-needed

-SNIP-

Already answered in a second thread he made about the same question…