So gradle hates me basically, All the libraries I could see in the editor (BetterFoliage) didn’t exist at compile time, and the ones that did exist at compile time (Minecraft/Forge) didn’t exist in the editor. yay Fixed by deleting all my gradle caches (project & global), invalidating IntelliJ caches, reinstalling the repository from scratch and restarting my computer. All this, 4 times - then it magically started working