TillW

oh... ok. Then one of your mod has ha terrible bug i think... you could search google after the name: com.gildedgames.orbis.lib.world.WorldObjectManager - then you found somethink linke orbis Library, this mod should have the bug... i so you can report the bug to the mod creator

Are you programming the mod or what?

You should test with if(com.gildedgames.orbis.lib.world.WorldObjectManager instanceof com.gildedgames.orbis_api.world.WorldObjectManager) because these are two different clases... if the error then still exsits please show some code.