Okay so the modpack is crashing when ran with security craft, I suppose its a mod conflict but dont know the source, However here is the crash report.
crash-2022-01-25_10.38.32-client.txt

That could be caused by a mixin library conflict that SecurityCraft ships with. Try using this modified version that doesn't ship with the mixin library that we use. As it doesn't come with the library, be sure that another mod that you use adds it (such as Phosphor).

Duplicate of #300.