Declare explicit NERB incompatibility in your mods.toml

[ChiefArug]

This will help people who try to install both mods understand why it crashes as it will show a specific incompatibility message rather than a generic crash.

[Elenterius]

i don't think that's possible in forge for 1.20.1

[ChiefArug]

You can declare an optional dependency on a version that does not exist, such as 9999+INCOMPATIBLE_WITH_ORB.