crash-2021-01-18_17.27.28-client.txt
I need CCL to run the thermal expansion series of mods in my dev environment I get the same error every time and I have tried the Universal and Deobucated jars.
I'm using eclipse and forge 1.12.2 - 14.23.5.2854

You cannot use the new-old MDK builds as they do not provide the proper GradleStart context to CCL. You will need to use the MDK for forge 14.23.5.2847 and bellow.