I have made a 1.12.2 server with the following mods:
Baubles
Backpack
Damage Indicators
Voxelmap
Battle towers
Portal gun
Ender Storage
Mo Creatures
Iron chest
Buildcraft
Buildcraft compat
Treecap
Thaumicenergistics
Morph
Libraries
Ichunutil
Biomes O Plenty
Bibliocraft
Tinkers Construct
Mantle
Optifine
Ic2
Extreme Reactors
Ae2
Ae2 stuff
Bdlib
Galacticraft Core
Galacticraft Planets
Micdoodle Core
Twilight Forest
Better FPS
Pam's Harvest Craft
AppleCore
Spice Of Life
Thermal Dynamics
Thermal Expansion
Thermal Foundation
Chicken Chunks
CoFHCore
CoFH World
Code Chicken Lib
Vanilla fix
Hwyla
Biomes you'll go
Zero Core
Thaumcraft
Thaumic JEI
JEI
Just Enough Resources
Just Enough Energisticd
Just Enough Harvest Craft
Tinkers JEI
Just Enough Reactors
Familiar fauna
Aether
Gravestone
Iron tanks
Deconstruction Table
As the forge server jar file starts up it runs for a few seconds and then proceeds to crash
Here is the crash report and log files generated after the crash,
Crash Report: https://pastebin.com/TGp6PHsg
"latest" file from log folder: https://pastebin.com/Ah1JidVN
"debug" file from log folder: https://pastebin.com/GSxGFjmr