It's all in the title. Game fails to load with both colormatic 3.0.0 and iris-1.2.0. Iris 1.2.0 just does not work with the current version of colormatic.

If you build #75 from source, you should hopefully be able to add Colormatic to Iris.

excited to see a release of this, I have a friend who is very interested in changing the color of redstone lines :D