Minecraft Version

1.18.x

Version

1.100.8

Details

The fromBlit function dose not work and says that it is a nil value

Which minecraft version specifically?
And can you show screenshots from CC:Tweaked and CC:Restitched (you can just swap the mod and modloader with the same world)

oh it did not work on eather of them i thought that it did not work for CC: Restitched anly but colors.toBlit work

Since you can reproduce this bug on CC:T, please reopen the issue there
https://github.com/cc-tweaked/CC-Tweaked/issues

colours.fromBlit was added in CC:T 1.105.0, and so is only available for Minecraft 1.19.4 and later (and 1.4.7 :D). I'm afraid it won't be present on any 1.18.x version.