This is just a snippet as these errors go on for quite a bit. The world still loads, I just noticed these and wanted to make you aware.

[09:58:27] [Server thread/INFO] [JustAnotherSpawner]: Registering BiomeGroup Dark Forest Center contains twilightforest.biomes.TFBiomeDarkForestCenter.Dark Forest Center from Dark Forest Center
[09:58:27] [Server thread/ERROR] [JustAnotherSpawner]: Duplicate entity class detected. Ignoring FML,JasName pair [AncientWarfareNpc.custom_3.leader.elite,AncientWarfareNpc.custom_3.leader.elite] for class, class class net.shadowmage.ancientwarfare.npc.entity.faction.NpcCustom_3LeaderElite
[09:58:27] [Server thread/ERROR] [JustAnotherSpawner]: Duplicate entity class detected. Ignoring FML,JasName pair [MoCreatures.FishBowl,MoCreatures.FishBowl] for class, class class drzhark.mocreatures.entity.item.MoCEntityFishBowl

Yes, this was added to detect when conflicting mappings were added but is overly sensitive and detects valid mappings.

It should be safe to ignore, I just haven't had time to look into and fix it.