Fails to load certain resourcepacks, such as New Default+, when coupled with Colormatic.

Can you send logs?

I have this same issue, but with Iris+Sodium (v1.1.2) and CIT Resewn (0.7.1 and tested with earlier versions aswell) as the only mods installed, since Colormatic is appearently incompatible with Iris and/or Sodium. Only Colormatic and CIT Resewn does not cause this for me. But maybe the problem is the same.
log file with an error:
latest.log

@Timolino456 That is not necessarily the same issue, please create a separate issue in situations like these and let authors decide if it's a duplicate issue or not.

In your case, the issue is broken paths. A resourcepack has folders/files that don't follow Minecraft's pack formatting rules. Either fix the resourcepack or enable Broken Paths in CIT Resewn's config.

This could be the issue here as well, could not. Still waiting on the logs.

The resource pack in question does have broken paths. I could not reproduce the error in a development environment.

Ah, then the answer I gave Timolino456 applies to you as well @Feranogame. Closing.

I'll reopen if there is actually some incompatibility.