I am unable to launch my pack after adding lootr 1.12.2 beta build latest.

Below is the crash report from forge/technic launcher (which we use for the modpack)
https://pastebin.com/Xs9uC4Xp

sorry i can't paste the entire log file here ti was too big.

Unfortunately that crash report isn't valid. Can you try posting it to gist.github.com?

The paste seems to have expired but please ensure you have installed MixinBooter.

I'm going to close this as there hasn't been any response.