Hi everyone! I am having the same problem. As of now, I am trying to run the modpack without any of the mods that are listed with UE or UD on the modloading process in the crash report. I'm hoping it works, and here is a list of all the mods I have temporarily removed:
I am not sure if any of these mods are considered core mods of the pack, and I'm hoping not as I really want to play this modpack.