[23:35:34] [Worker-Main-10/FATAL]: Failed to schedule load callback for chunk [-233, -362]
 java.util.concurrent.CompletionException: net.minecraft.server.v1_16_R1.ReportedException: Exception generating new chunk
     at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:273) ~[?:1.8.0_252]
     at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:280) ~[?:1.8.0_252]
     at java.util.concurrent.CompletableFuture.uniCompose(CompletableFuture.java:975) ~[?:1.8.0_252]
     at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:940) ~[?:1.8.0_252]
     at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:456) ~[?:1.8.0_252]
     at net.minecraft.server.v1_16_R1.ChunkTaskQueueSorter.b(SourceFile:58) ~[spigot_1.16.1.jar:git-Spigot-758abbe-2b00831]
     at net.minecraft.server.v1_16_R1.ThreadedMailbox.e(SourceFile:94) [spigot_1.16.1.jar:git-Spigot-758abbe-2b00831]
     at net.minecraft.server.v1_16_R1.ThreadedMailbox.a(SourceFile:137) [spigot_1.16.1.jar:git-Spigot-758abbe-2b00831]
     at net.minecraft.server.v1_16_R1.ThreadedMailbox.run(SourceFile:105) [spigot_1.16.1.jar:git-Spigot-758abbe-2b00831]
     at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1402) [?:1.8.0_252]
     at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) [?:1.8.0_252]
     at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056) [?:1.8.0_252]
     at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692) [?:1.8.0_252]
     at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157) [?:1.8.0_252]
 Caused by: net.minecraft.server.v1_16_R1.ReportedException: Exception generating new chunk
     at net.minecraft.server.v1_16_R1.PlayerChunkMap.lambda$26(PlayerChunkMap.java:551) ~[spigot_1.16.1.jar:git-Spigot-758abbe-2b00831]
     at com.mojang.datafixers.util.Either$Left.map(Either.java:38) ~[spigot_1.16.1.jar:git-Spigot-758abbe-2b00831]
     at net.minecraft.server.v1_16_R1.PlayerChunkMap.lambda$24(PlayerChunkMap.java:536) ~[spigot_1.16.1.jar:git-Spigot-758abbe-2b00831]
     at java.util.concurrent.CompletableFuture.uniCompose(CompletableFuture.java:966) ~[?:1.8.0_252]
     ... 11 more
 Caused by: java.lang.UnsupportedOperationException
     at com.google.common.collect.ImmutableMap.clear(ImmutableMap.java:620) ~[spigot_1.16.1.jar:git-Spigot-758abbe-2b00831]
     at net.minecraft.server.v1_16_R1.ChunkGenerator.updateStructureSettings(ChunkGenerator.java:309) ~[spigot_1.16.1.jar:git-Spigot-758abbe-2b00831]
     at net.minecraft.server.v1_16_R1.ChunkGenerator.a(ChunkGenerator.java:233) ~[spigot_1.16.1.jar:git-Spigot-758abbe-2b00831]
     at net.minecraft.server.v1_16_R1.ChunkGenerator.createStructures(ChunkGenerator.java:212) ~[spigot_1.16.1.jar:git-Spigot-758abbe-2b00831]
     at net.minecraft.server.v1_16_R1.ChunkStatus.d(SourceFile:51) ~[spigot_1.16.1.jar:git-Spigot-758abbe-2b00831]
     at net.minecraft.server.v1_16_R1.ChunkStatus.a(SourceFile:219) ~[spigot_1.16.1.jar:git-Spigot-758abbe-2b00831]
     at net.minecraft.server.v1_16_R1.PlayerChunkMap.lambda$26(PlayerChunkMap.java:538) ~[spigot_1.16.1.jar:git-Spigot-758abbe-2b00831]
     at com.mojang.datafixers.util.Either$Left.map(Either.java:38) ~[spigot_1.16.1.jar:git-Spigot-758abbe-2b00831]
     at net.minecraft.server.v1_16_R1.PlayerChunkMap.lambda$24(PlayerChunkMap.java:536) ~[spigot_1.16.1.jar:git-Spigot-758abbe-2b00831]
     at java.util.concurrent.CompletableFuture.uniCompose(CompletableFuture.java:966) ~[?:1.8.0_252]
     ... 11 more