I dont know what I did but now everytime i try to join quake it takes me to this other mods main page in quake and stuff is like blanked out in black and white, does anyone know what I can do to get it back to regular quake 3

Everytime I try to join a game I get Error: Length of /sounds/feedback/hit.wav is 0

Can someone explain what this mans and what I would have to do to fix this, its really annoying

have same problem I need help