Why is Minecraft Bad?

---- Minecraft Crash Report ----

WARNING: coremods are present:
  SpongeCoremod (spongeforge-1.12.2-2705-7.1.0-BETA-3361.jar)
Contact their authors BEFORE contacting forge

// Uh... Did I do that?

Time: 11/21/19 6:12 PM
Description: Exception in server tick loop

java.lang.RuntimeException: derp
	at net.minecraft.world.storage.SaveHandler.redirect$onLoadWorldInfo$bbl000(SaveHandler.java:1073)
	at net.minecraft.world.storage.SaveHandler.func_75757_d(SaveHandler.java:132)
	at org.spongepowered.common.world.WorldManager.loadAllWorlds(WorldManager.java:702)
	at net.minecraft.server.MinecraftServer.func_71247_a(MinecraftServer.java:3541)
	at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:270)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:486)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.RuntimeException: Attempt failed when reading Sponge level data for [world] from file [level_sponge.dat]!
	at net.minecraft.world.storage.SaveHandler.loadSpongeDatData(SaveHandler.java:619)
	at net.minecraft.world.storage.SaveHandler.redirect$onLoadWorldInfo$bbl000(SaveHandler.java:1071)
	... 6 more
Caused by: java.util.zip.ZipException: Not in GZIP format
	at java.util.zip.GZIPInputStream.readHeader(Unknown Source)
	at java.util.zip.GZIPInputStream.<init>(Unknown Source)
	at java.util.zip.GZIPInputStream.<init>(Unknown Source)
	at net.minecraft.nbt.CompressedStreamTools.func_74796_a(CompressedStreamTools.java:26)
	at net.minecraft.world.storage.SaveHandler.loadSpongeDatData(SaveHandler.java:616)
	... 7 more


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

-- Head --
Thread: Server thread
Stacktrace:
	at net.minecraft.world.storage.SaveHandler.redirect$onLoadWorldInfo$bbl000(SaveHandler.java:1073)
	at net.minecraft.world.storage.SaveHandler.func_75757_d(SaveHandler.java:132)

-- Sponge PhaseTracker --
Details:
	Phase Stack: [Empty stack]
Stacktrace:
	at net.minecraft.server.MinecraftServer.handler$onCrashReport$zjj000(MinecraftServer.java:3973)
	at net.minecraft.server.MinecraftServer.func_71230_b(MinecraftServer.java:889)
	at net.minecraft.server.dedicated.DedicatedServer.func_71230_b(DedicatedServer.java:371)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:558)
	at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
	Minecraft Version: 1.12.2
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_221, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 2512049864 bytes (2395 MB) / 3819438080 bytes (3642 MB) up to 3819438080 bytes (3642 MB)
	JVM Flags: 2 total; -Xmx4G -Xms3G
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	FML: MCP 9.42 Powered by Forge 14.23.5.2768 9 mods loaded, 9 mods active
	States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored

	| State   | ID          | Version                     | Source                                             | Signature                                |
	|:------- |:----------- |:--------------------------- |:-------------------------------------------------- |:---------------------------------------- |
	| UCHIJAA | minecraft   | 1.12.2                      | minecraft.jar                                      | None                                     |
	| UCHIJAA | mcp         | 9.42                        | minecraft.jar                                      | None                                     |
	| UCHIJAA | FML         | 8.0.99.99                   | forge2.jar                                         | e3c3d50c7c986df74c645c0ac54639741c90a557 |
	| UCHIJAA | forge       | 14.23.5.2768                | forge2.jar                                         | e3c3d50c7c986df74c645c0ac54639741c90a557 |
	| UCHIJAA | spongeapi   | 7.1.0-SNAPSHOT-7105dfc      | spongeforge-1.12.2-2705-7.1.0-BETA-3361.jar        | None                                     |
	| UCHIJAA | sponge      | 1.12.2-2705-7.1.0-BETA-3361 | spongeforge-1.12.2-2705-7.1.0-BETA-3361.jar        | 6729a677746f8cf63ef31881f913ed15d431b7f0 |
	| UCHIJAA | nucleus     | 1.6.1-S7.1                  | Nucleus-1.6.1-S7.1-MC1.12.2-plugin.jar             | None                                     |
	| UCHIJAA | pixelmon    | 2.8.3                       | pixelmongenerations-1-12-2-2-8-3-universal-jar.jar | None                                     |
	| UCHIJAA | pixelextras | 2.3.9                       | PixelExtras-1.12.2-2.3.9-universal.jar             | None                                     |

	Loaded coremods (and transformers):
SpongeCoremod (spongeforge-1.12.2-2705-7.1.0-BETA-3361.jar)
  org.spongepowered.common.launch.transformer.SpongeSuperclassTransformer
	Profiler Position: N/A (disabled)
	Player Count: 0 / 20; []
	Is Modded: Definitely; Server brand changed to 'fml,forge,sponge'
	Type: Dedicated Server (map_server.txt)