There seems to be an issue when dynamic trees BOP is installed with Dynamic Trees+ involving mushrooms- it's been tested in isolation and the error still comes up even with only the mods needed to run the combo installed

https://mclo.gs/nx0eTNp

same, seems like one of the mods were updated

BOP has updated and now an update is needed on our side. Please downgrade Biomes o' Plenty to version 18 until this is fixed