Server crash, I have no clue how to read it

---- Minecraft Crash Report ----

WARNING: coremods are present:
EnderCorePlugin (EnderCore-1.12.2-0.5.43.jar)
LoadingPlugin (Quark-r1.5-139.jar)
SpongeCoremod (spongeforge-1.12.2-2768-7.1.4.jar)
CTMCorePlugin (CTM-MC1.12.2-0.3.3.22.jar)
Contact their authors BEFORE contacting forge

// Why did you do that?

Time: 1/22/19 4:10 PM
Description: Exception in server tick loop

java.lang.RuntimeException: derp
at net.minecraft.world.storage.SaveHandler.redirect$onLoadWorldInfo$bcl000(SaveHandler.java:1073)
at net.minecraft.world.storage.SaveHandler.func_75757_d(SaveHandler.java:122)
at org.spongepowered.common.world.WorldManager.createWorldProperties(WorldManager.java:406)
at net.minecraftforge.common.DimensionManager.initDimension(DimensionManager.java:801)
at net.minecraft.server.MinecraftServer.func_71218_a(MinecraftServer.java:5144)
at codechicken.chunkloader.manager.ChunkLoaderManager.getWorld(ChunkLoaderManager.java:505)
at codechicken.chunkloader.manager.ChunkLoaderManager$ChunkLoaderOrganiser.revive(ChunkLoaderManager.java:326)
at codechicken.chunkloader.manager.ChunkLoaderManager$PlayerOrganiser.revive(ChunkLoaderManager.java:390)
at codechicken.chunkloader.manager.ChunkLoaderManager.processLoaderStates(ChunkLoaderManager.java:693)
at codechicken.chunkloader.manager.ChunkLoaderManager.onTickEnd(ChunkLoaderManager.java:670)
at codechicken.chunkloader.handler.ChunkLoaderEventHandler.worldTick(ChunkLoaderEventHandler.java:32)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_775_ChunkLoaderEventHandler_worldTick_WorldTickEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:687)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:641)
at net.minecraftforge.fml.common.FMLCommonHandler.onPostWorldTick(FMLCommonHandler.java:274)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:776)
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:397)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.RuntimeException: Attempt failed when reading Sponge level data for [DIM11] from file [level_sponge.dat]!
at net.minecraft.world.storage.SaveHandler.loadSpongeDatData(SaveHandler.java:619)
at net.minecraft.world.storage.SaveHandler.redirect$onLoadWorldInfo$bcl000(SaveHandler.java:1071)
… 20 more
Caused by: java.util.zip.ZipException: Not in GZIP format
at java.util.zip.GZIPInputStream.readHeader(Unknown Source)
at java.util.zip.GZIPInputStream.(Unknown Source)
at java.util.zip.GZIPInputStream.(Unknown Source)
at net.minecraft.nbt.CompressedStreamTools.func_74796_a(CompressedStreamTools.java:26)
at net.minecraft.world.storage.SaveHandler.loadSpongeDatData(SaveHandler.java:616)
… 21 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$onLoadWorldInfo$bcl000(SaveHandler.java:1073)
at net.minecraft.world.storage.SaveHandler.func_75757_d(SaveHandler.java:122)
at org.spongepowered.common.world.WorldManager.createWorldProperties(WorldManager.java:406)
at net.minecraftforge.common.DimensionManager.initDimension(DimensionManager.java:801)
at net.minecraft.server.MinecraftServer.func_71218_a(MinecraftServer.java:5144)
at codechicken.chunkloader.manager.ChunkLoaderManager.getWorld(ChunkLoaderManager.java:505)
at codechicken.chunkloader.manager.ChunkLoaderManager$ChunkLoaderOrganiser.revive(ChunkLoaderManager.java:326)
at codechicken.chunkloader.manager.ChunkLoaderManager$PlayerOrganiser.revive(ChunkLoaderManager.java:390)
at codechicken.chunkloader.manager.ChunkLoaderManager.processLoaderStates(ChunkLoaderManager.java:693)
at codechicken.chunkloader.manager.ChunkLoaderManager.onTickEnd(ChunkLoaderManager.java:670)
at codechicken.chunkloader.handler.ChunkLoaderEventHandler.worldTick(ChunkLoaderEventHandler.java:32)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_775_ChunkLoaderEventHandler_worldTick_WorldTickEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:687)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:641)
at net.minecraftforge.fml.common.FMLCommonHandler.onPostWorldTick(FMLCommonHandler.java:274)

– Sponge PhaseTracker –
Details:
Phase Stack: [Empty stack]
Stacktrace:
at net.minecraft.server.MinecraftServer.handler$onCrashReport$zjk000(MinecraftServer.java:3980)
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)