Raspberry PI 3B+ Buster, Server not working

#!/bin/bash

cd /home/pi
. env/bin/activate
echo “DONE”
anvil-app-server --app your_app_name

this is what i have in my bash file.
you only need to create an empty file, inside you put that, save … run … and its done

Of course, you need to clone your app from git hub before you do that, to /home/pi
And already create the environment env as you see in the tutorial

you try