Peugeot 206 xr bva 2000

First of all, hello everyone. I have a fully automatic Peugeot 206 XR BVA 2000 model. I started it this morning. First, the snow and sport modes flashed on and off. Then I drove on a flat road. The car wouldn't take any gas. When I pressed the gas pedal, I heard a loud gas noise. I was stuck on a hill and couldn't get up. I stopped it and went up the hill again. But this problem persists on the flat road. What should I do now? I look forward to your valuable feedback.