1.12 Modpacks crash on start


Hi there,
I’m having problems launching any 1.12 modpack. A few seconds after start they crash. Crash logs are here (Errors and fatals): https://paste.feed-the-beast.com/view/0951756e
Happens with StoneBlock2, StoneBlock as well as with SevTechAges

Main problem seems to be this: Patcher expecting non-empty class data file for net.minecraft.crash.CrashReport$1, but received empty

Any ideas how to fix this? No reinstalling/updates didn’t change anything. Vanilla is running without any trouble in any Version. SF3 and FS also working fine

Thanks a lot!


Please post full log, instructions for that can be found here: