I have errors that the gamemode file could not be found:

[breach_current] gamemodes/breach/gamemode/player.lua:6: attempt to concatenate a nil value
1. onsuccess - gamemodes/breach/gamemode/player.lua:6
2. unknown - lua/includes/modules/http.lua:35

So i went into the folder to search the problem and i found out that there was no breach gamemode folder in:
C:\Program Files (x86)\Steam\steamapps\common\GarrysMod\garrysmod\gamemodes

So can anybody help me with this problem? I would be grateful!