Help, I cant Lauch GMOD

Yesterday I was playing Gmod normal but , right 5 sec ago , When I Lauch GMod . is said SetupArrayProps r
What do I do to Fix that, And While In Game , I cant use TF2 Gun EXcpet Pyro FlameThower

Could you revise your spelling? TF2? What? Revise spelling and post specs.