it doesnt launch anymore

[Josephtobi]

an error comes up during building

[metonym]

Hello @Josephtobi – are you using fastapi version 0.104? If so, it requires a Python version >=3.8.

Could you try including in your service deployment an env var with a custom Python version (e.g., PYTHON_VERSION=3.8.2)? See the Render docs on specifying a Python version.