Custom Dimension Crashes Game (NeoForge)

I was working on a mod and I wanted to see if my custom particles were working, but every time I loaded a new chunk, it would kick me out and say "connection lost, server closed" 

I closed the world, but you have to stop Gradle to close the game. "Quit game" does not work.

Log:
[18:31:31] [Server thread/ERROR] [minecraft/BlockableEventLoop]: Error executing task on Chunk source main thread executor for ebimremastered:leafy_dimension
net.minecraft.ReportedException: Exception generating new chunk
at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.level.ChunkMap.lambda$applyStep$19(ChunkMap.java:641) ~[neoforge-21.1.65-minecraft.jar%23183!/:?] {re:classloading,pl:accesstransformer:B}
at TRANSFORMER/minecraft@1.21.1/net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:148) ~[neoforge-21.1.65-minecraft.jar%23183!/:?] {re:classloading,pl:accesstransformer:B}
at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.level.ServerChunkCache$MainThreadExecutor.doRunTask(ServerChunkCache.java:559) ~[neoforge-21.1.65-minecraft.jar%23183!/:?] {re:classloading}
at TRANSFORMER/minecraft@1.21.1/net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoop.java:122) ~[neoforge-21.1.65-minecraft.jar%23183!/:?] {re:classloading,pl:accesstransformer:B}
at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.level.ServerChunkCache$MainThreadExecutor.pollTask(ServerChunkCache.java:568) ~[neoforge-