This is the startup log message: https://gist.github.com/KasperFranz/d7aee68b43390729b589f07a255923dc

Running the latest beyond modpack (version 1.1.0) on Java 1.8.0_121

I've never seen this before, and if it's not a crash I doubt that I'd do anything about it.

You know what... this might be a compat issue with one of the mods in ftb beyond...

My modpack (which is not Beyond): https://www.technicpack.net/modpack/magibeta-pack.940049

No. The issue is with reflection, totally unrelated to that link.

Could it be this here not being a valid url?

Why did it get closed?