PwnDepot

I am new to forge so i'm not sure if i'm missing a couple libraries/classes or just this one but I am missing DimensionManager in version 1.16.1 of minecraft / 32.0.68 of forge. https://prnt.sc/tjfqjv I am using IntelliJ as my ide. Is this class deprecated? I checked documentation and couldnt find anything. I redownloaded forge as well, and ran genIntellijRuns in Gradle. Minecraft launches fine and I can do other stuff like add modded blocks. Any help would be greatly appreciated, thanks