Help?

Hey guys im trying to play rp_c18_v1 on my mac but i cant see anything, because its all black, Ive uninstalled,deleted garrysmod/garrysmod, dl several different maps, everything i just dont know what els to do. When I click tab, then go to characters on (hl2rp) i can see everything but then when i get out of the hl2rp menu i cant see anything. Help?!

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