I am getting these garbage collection overflow errors when I try to launch the Arisen pack (beta-44). Don't know what the issue is. Anyone have an idea?
Confirming the same problem with ivarsten
I didn't see this earlier, sorry. :)
This is simply a problem of not having enough RAM allocated to Minecraft, and if you aren't on Java 8, not being on Java 8.
Founder of the Chondrite Collective on YouTube.