SVN Gamemode Error

Hello, I’ve recently downloaded gamemodes such as Gmod RP and Dark RP, I used SVN because I thought the latest is the best, so I make the folder, use SVN checkout to the right URL and I get it, and it’s fully up to date. So when I go to play it in Garry’s Mod, I see the gamemode is the list, so I choose it, but to my surprise I found that it played sandbox instead, I double checked and made sure it was set to Dark RP, still Sandbox. When I set Dark RP to the override setting, it played Base instead, if anyone could please help, I’d very much appreciate it.