---- Minecraft Crash Report ----
// I let you down. Sorry :(

Time: 5/28/18 11:49 AM
Description: Exception generating new chunk

java.util.concurrent.ExecutionException: java.lang.UnsupportedOperationException
	at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2237)
	at sk.c(SourceFile:126)
	at ss.a(SourceFile:84)
	at st.c(SourceFile:143)
	at sl.i_(SourceFile:223)
	at net.minecraft.server.MinecraftServer.w(SourceFile:693)
	at net.minecraft.server.MinecraftServer.v(SourceFile:626)
	at dii.v(SourceFile:156)
	at net.minecraft.server.MinecraftServer.run(SourceFile:531)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.UnsupportedOperationException
	at bpw.a(SourceFile:108)
	at sq.a(SourceFile:232)
	at bus.a(SourceFile:118)
	at bus.a(SourceFile:23)
	at byl.a(SourceFile:20)
	at byl.a(SourceFile:12)
	at bsl.a(SourceFile:27)
	at bby.a(SourceFile:515)
	at bpy.a(SourceFile:109)
	at sz.a(SourceFile:12)
	at sy.a(SourceFile:34)
	at bqc.a(SourceFile:87)
	at te.a(SourceFile:59)
	at te.a(SourceFile:23)
	at agg$a.a(SourceFile:131)
	at agg$a$$Lambda$1398/1360636498.apply(Unknown Source)
	at java.util.concurrent.CompletableFuture$AsyncApply.exec(CompletableFuture.java:501)
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
	at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:902)
	at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1689)
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1644)
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Thread: Server thread
Stacktrace:
	at sk.a(SourceFile:170)

-- Chunk to be generated --
Details:
	Location: -4,-24
	Position hash: -98784247812
	Generator: brt@79042a94
Stacktrace:
	at sk.a(SourceFile:170)
	at sk.c(SourceFile:129)
	at ss.a(SourceFile:84)
	at st.c(SourceFile:143)
	at sl.i_(SourceFile:223)
	at net.minecraft.server.MinecraftServer.w(SourceFile:693)
	at net.minecraft.server.MinecraftServer.v(SourceFile:626)
	at dii.v(SourceFile:156)
	at net.minecraft.server.MinecraftServer.run(SourceFile:531)
	at java.lang.Thread.run(Thread.java:745)

-- Affected level --
Details:
	Level name: Snappy new world
	All players: 1 total; [sn['bacomatic'/726, l='Snappy new world', x=-7.89, y=69.00, z=45.87]]
	Chunk stats: ServerChunkCache: 2609 Drop: 0
	Level seed: -4561853493053650267
	Level generator: ID 02 - largeBiomes, ver 0. Features enabled: true
	Level generator options: {}
	Level spawn location: World: (-16,69,32), Chunk: (at 0,4,0 in -1,2; contains blocks -16,0,32 to -1,255,47), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 1263 game time, 1263 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 133149 (now: false), thunder time: 129590 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false

-- System Details --
Details:
	Minecraft Version: 18w21b
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 897641824 bytes (856 MB) / 2147483648 bytes (2048 MB) up to 8589934592 bytes (8192 MB)
	JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx8G -Xms1G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=16M
	Profiler Position: N/A (disabled)
	Player Count: 1 / 8; [sn['bacomatic'/726, l='Snappy new world', x=-7.89, y=69.00, z=45.87]]
	Data Packs: vanilla
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.