I run little private server. Currently it is official Forge build for 1.10.2.
My current modpack required LibLib, so I added it and tried to run. Client worked properly and stable, but when I tried to run server with this modpack it crashed.
Server log says:
Fatal errors were detected during the transition from PREINITIALIZATION to INITIALIZATION
...
Caught exception from LibrarianLib Stage 2 (librarianliblate)
java.lang.ExceptionInInitializerError
at com.teamwizardry.librarianlib.common.util.autoregister.AutoRegisterHandler.handle(AutoRegisterHandler.kt:32)...

The same problem appears even if I launch server only with LibLib and Forgelin. The problem does not appear when LibLib, Forgelin and dependent mods are removed. A lot of mods use LibLib, so it would be great to hear from you how to fix this bug. Also, should I attach log or crash report?

That is not nearly enough information. Give a larger log, please.

That's a super old version of liblib. weird.

crash-2017-07-31_19.14.42-server.txt
fml-server-latest.txt

That's the one I found on CurseForge, right here
https://minecraft.curseforge.com/projects/librarianlib?gameCategorySlug=mc-mods&projectID=252910