WSAD keys never work during the game

I have been playing GTA:SA for about 3 hours and saved. Today I tried to play it again and CJ doesn’t walk. Turns out WSAD keys don’t work during the game. Even the key config option, seems like the game itself cannot get the signal of WSAD keys. Thank you so much for letting so many bugs appear on pc and mac, Rockstar

Starlightblue9 about Grand Theft Auto: San Andreas