---- Minecraft Crash Report ----
// Surprise! Haha. Well, this is awkward.

Time: 9/15/21, 11:12 PM
Description: Exception in server tick loop

java.util.concurrent.CompletionException: z: Feature placement
	at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:314)
	at java.base/java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:319)
	at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1155)
	at java.base/java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:478)
	at abl.b(SourceFile:58)
	at ask.g(SourceFile:91)
	at ask.a(SourceFile:146)
	at ask.run(SourceFile:102)
	at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1434)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:295)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1016)
	at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1665)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1598)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:183)
Caused by: z: Feature placement
	at abj.a(SourceFile:637)
	at com.mojang.datafixers.util.Either$Left.map(Either.java:38)
	at abj.a(SourceFile:619)
	at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1146)
	... 11 more
Caused by: java.lang.IndexOutOfBoundsException: Index 0 out of bounds for length 0
	at java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:64)
	at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:70)
	at java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:266)
	at java.base/java.util.Objects.checkIndex(Objects.java:359)
	at java.base/java.util.ArrayList.get(ArrayList.java:427)
	at czb.a(SourceFile:52)
	at czb.a(SourceFile:47)
	at cyz.a(SourceFile:68)
	at cti.b(SourceFile:33)
	at cti.b(SourceFile:11)
	at cso.a(SourceFile:24)
	at ctb.a(SourceFile:63)
	at cth.a(SourceFile:38)
	at java.base/java.util.stream.Streams$StreamBuilderImpl.forEachRemaining(Streams.java:411)
	at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:762)
	at cth.a(SourceFile:29)
	at ctb.a(SourceFile:63)
	at cth.a(SourceFile:38)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
	at java.base/java.util.stream.Streams$StreamBuilderImpl.forEachRemaining(Streams.java:411)
	at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:762)
	at java.base/java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:276)
	at java.base/java.util.stream.Streams$StreamBuilderImpl.forEachRemaining(Streams.java:411)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
	at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596)
	at cth.a(SourceFile:29)
	at ctb.a(SourceFile:63)
	at cth.a(SourceFile:38)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
	at java.base/java.util.stream.IntPipeline$1$1.accept(IntPipeline.java:180)
	at java.base/java.util.stream.Streams$RangeIntSpliterator.forEachRemaining(Streams.java:104)
	at java.base/java.util.Spliterator$OfInt.forEachRemaining(Spliterator.java:699)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
	at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596)
	at cth.a(SourceFile:29)
	at ctb.a(SourceFile:63)
	at cob.a(SourceFile:288)
	at cod.c(SourceFile:115)
	at cod.a(SourceFile:256)
	at abj.a(SourceFile:625)
	... 14 more


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

-- System Details --
Details:
	Minecraft Version: 21w37a
	Minecraft Version ID: 21w37a
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 16.0.1, Microsoft
	Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Microsoft
	Memory: 969321656 bytes (924 MiB) / 2147483648 bytes (2048 MiB) up to 2147483648 bytes (2048 MiB)
	CPUs: 16
	Processor Vendor: GenuineIntel
	Processor Name: Intel(R) Core(TM) i7-10700K CPU @ 3.80GHz
	Identifier: Intel64 Family 6 Model 165 Stepping 5
	Microarchitecture: unknown
	Frequency (GHz): 3.79
	Number of physical packages: 1
	Number of physical CPUs: 8
	Number of logical CPUs: 16
	Graphics card #0 name: NVIDIA GeForce RTX 3080
	Graphics card #0 vendor: NVIDIA (0x10de)
	Graphics card #0 VRAM (MB): 4095.00
	Graphics card #0 deviceId: 0x2206
	Graphics card #0 versionInfo: DriverVersion=27.21.14.6663
	Memory slot #0 capacity (MB): 16384.00
	Memory slot #0 clockSpeed (GHz): 3.20
	Memory slot #0 type: DDR4
	Memory slot #1 capacity (MB): 16384.00
	Memory slot #1 clockSpeed (GHz): 3.20
	Memory slot #1 type: DDR4
	Virtual memory max (MB): 37552.63
	Virtual memory used (MB): 20656.56
	Swap memory total (MB): 4864.00
	Swap memory used (MB): 149.83
	JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
	Player Count: 1 / 8; [abx['BlueMasonick'/168, l='ServerLevel[Sharpleaf - Snapshot 21w37a]', x=-1293.43, y=167.40, z=-5514.29]]
	Data Packs: vanilla
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.