Failed to start FML

[TheCrystallizedVoid]

Minecraft version

1.21.1

Describe the bug

NeoForge keeps sending back an error saying "unable to get no-arg constructor" ONLY when Connector is in the mods folder

Steps to reproduce

1. Download Connector
2. Place in mods folder
3. See attached screenshot

...

Logs

No response

Additional context

I have tried launching with other mods and with only Connector + Connector Extras + Forgified Fabric. As long as Connector is in the mods folder, it will produce this error