“Internal Server Error” when I create a website in Docker desktop(Windows 10)

I followed this video exactly: https://www.youtube.com/watch?v=IP8NpcvcIDk, but when I open the site in my browser, it says “Internal Server Error”.
chatgpt says it could be a port conflict, but I’ve tried several other ports and none of them work, and my Docker desktop is a recent install, and restarting it doesn’t work either!
The image I use to run tryton on the same port in Docker logs in fine, but the image I use to run erpnext does not!