Is it a mod compatibility issue?

Yes

Minecraft version

1.20.1

Describe the issue

game cannot open due to a "complex solver error"
only happens on quilt
2023-07-24-7.log.gz

The latest version of Immptl is compatible with my fork of gravity api https://modrinth.com/mod/gravity-api-fork
It is not compatible with the gravity api on quilt because a fabric mod cannot depend on a quilt mod.