Fabric 1.20.1, mod version 1.0

when mod 'forge config api port' is not installed, the game crashes on load with a very non-intuitive error.

This mod should, in order of preference:

1. depend optionally on forge config api (that is, it cannot be configured if not installed, but works with default settings)
2. depend required on this mod (so that the fabric loader will produce a clean error message)

had this same issue

resolved in 1.21 version (it is a required dependency)