Bug? Cannot load mixin config (crash)

[Dust-Pile]

I have tried everything I can possibly think of, but nothing changes. Same error messages every time. I'm really hoping someone knows what's happened here.

I'm working on a forge project. It's not my first- I've used mixins successfully before. When I run data, I get the following error:
Exception in thread "main" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
which boils down to joptsimple.UnrecognizedOptionException: mixin.config is not a recognized option

When I run client, depending on whether a certain dependency is enabled, I either get no error with mixins not loading or this error:
Caused by: java.lang.IllegalArgumentException: The specified resource 'mixins.cts_compats.json' was invalid or could not be read

Here is the repository: https://github.com/Dust-Pile/cts_compats/tree/mixin-debug

Logs:
Data:

• latest.log
• debug.log

Client:

• latest.log
• debug.log