---- Minecraft Crash Report ----
// My bad.

Time: 1/10/21, 6:19 AM
Description: Ticking block entity

java.lang.IllegalArgumentException
	at afz.a(SourceFile:20)
	at afz.a(SourceFile:39)
	at bqz.i(SourceFile:178)
	at bqz.c(SourceFile:93)
	at cdi.aj_(SourceFile:62)
	at brx.O(SourceFile:510)
	at aag.a(SourceFile:429)
	at net.minecraft.server.MinecraftServer.b(SourceFile:871)
	at net.minecraft.server.MinecraftServer.a(SourceFile:811)
	at eng.a(SourceFile:91)
	at net.minecraft.server.MinecraftServer.w(SourceFile:670)
	at net.minecraft.server.MinecraftServer.a(SourceFile:257)
	at java.base/java.lang.Thread.run(Thread.java:834)


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

-- Head --
Thread: Server thread
Stacktrace:
	at afz.a(SourceFile:20)
	at afz.a(SourceFile:39)
	at bqz.i(SourceFile:178)
	at bqz.c(SourceFile:93)
	at cdi.aj_(SourceFile:62)

-- Block entity being ticked --
Details:
	Name: minecraft:mob_spawner // cdi
	Block: Block{minecraft:spawner}
	Block location: World: (-134,58,-133), Chunk: (at 10,3,11 in -9,-9; contains blocks -144,0,-144 to -129,255,-129), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
	Block: Block{minecraft:spawner}
	Block location: World: (-134,58,-133), Chunk: (at 10,3,11 in -9,-9; contains blocks -144,0,-144 to -129,255,-129), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
Stacktrace:
	at brx.O(SourceFile:510)
	at aag.a(SourceFile:429)

-- Affected level --
Details:
	All players: 1 total; [aah['videogamesm12'/108, l='ServerLevel[Oops]', x=-133.33, y=58.00, z=-132.23]]
	Chunk stats: ServerChunkCache: 4761
	Level dimension: minecraft:overworld
	Level spawn location: World: (-140,33,-240), Chunk: (at 4,2,0 in -9,-15; contains blocks -144,0,-240 to -129,255,-225), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
	Level time: 1611 game time, 1611 day time
	Level name: Oops
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
	Level weather: Rain time: 135706 (now: false), thunder time: 56831 (now: false)
	Known server brands: vanilla
	Level was modded: false
	Level storage version: 0x04ABD - Anvil
Stacktrace:
	at net.minecraft.server.MinecraftServer.b(SourceFile:871)
	at net.minecraft.server.MinecraftServer.a(SourceFile:811)
	at eng.a(SourceFile:91)
	at net.minecraft.server.MinecraftServer.w(SourceFile:670)
	at net.minecraft.server.MinecraftServer.a(SourceFile:257)
	at java.base/java.lang.Thread.run(Thread.java:834)

-- System Details --
Details:
	Minecraft Version: 1.16.4
	Minecraft Version ID: 1.16.4
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 11.0.9.1, AdoptOpenJDK
	Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), AdoptOpenJDK
	Memory: 573282640 bytes (546 MB) / 1159725056 bytes (1106 MB) up to 2147483648 bytes (2048 MB)
	CPUs: 16
	JVM Flags: 3 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xms1024m -Xmx2048m
	Player Count: 1 / 8; [aah['videogamesm12'/108, l='ServerLevel[Oops]', x=-133.33, y=58.00, z=-132.23]]
	Data Packs: vanilla
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.