Cant launch Reflex app with railway using Brody's template.

I follow all directions and copy over the files and it will build but i end up with 502 errors. The world will not turn green in the networking section in settings.
I do not get an errors in my logs besides 502 in https when i try to visit local railway site. Originally needed start command. I sent it python app.py and it would build but error but wont launch that way. Must use Nixpacks, which are depreciated or soon to be and I had to turn off the metal builder to get it to build without error and not need the custom command. Now it builds, no errors until the 502.