Clipboard error on Preinit:

[09:17:03] [Client thread/ERROR]: The following problems were captured during this phase
[09:17:03] [Client thread/ERROR]: Caught exception from clipboard
java.lang.RuntimeException: java.lang.ClassNotFoundException: net.shadowfacts.forgelin.KotlinAdapter

Full Log: HERE

Even with all but base mods disabled, Still get the same error:
Core Mods Log: HERE

Forgelin is required.

crap. Sorry about that. When it came up that your ShadowMC lib was a dependency in Forge I didn't think to check for any others. ::facepalm::