I'm assuming this is DarkRP? That's very strange I've never heard of that one before. All I could recommend is either removing and downloading the map again, remounting CS:S or verifying the game cache
Appeal accepted, just a FFRP warn will suffice instead. I'll work with Bat and the rest of our staff team to further clarify the FFRP area in the MOTD to prevent situations like this happening again in the future.