Server Errors (Won't Start Up)

I have tried deleting and renaming files but still no luck.

---- Minecraft Crash Report ----

WARNING: coremods are present:
SpongeCoremod (spongeforge-1.12.2-2768-7.1.6-RC3557.jar)
Contact their authors BEFORE contacting forge

// Why did you do that?

Time: 2/14/19 4:28 PM
Description: Exception in server tick loop

java.lang.RuntimeException: derp
at net.minecraft.world.storage.SaveHandler.redirect$onLoadWorldInfo$bcn000(SaveHandler.java:1073)
at net.minecraft.world.storage.SaveHandler.func_75757_d(SaveHandler.java:122)
at org.spongepowered.common.world.WorldManager.loadAllWorlds(WorldManager.java:711)
at net.minecraft.server.MinecraftServer.func_71247_a(MinecraftServer.java:3545)
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 [ultra] from file [level_sponge.dat]!
at net.minecraft.world.storage.SaveHandler.loadSpongeDatData(SaveHandler.java:619)
at net.minecraft.world.storage.SaveHandler.redirect$onLoadWorldInfo$bcn000(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.(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)
… 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$onLoadWorldInfo$bcn000(SaveHandler.java:1073)
at net.minecraft.world.storage.SaveHandler.func_75757_d(SaveHandler.java:122)

– Sponge PhaseTracker –
Details:
Phase Stack: [Empty stack]
Stacktrace:
at net.minecraft.server.MinecraftServer.handler$onCrashReport$zjm000(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_191, Oracle Corporation
Java VM Version: Java HotSpot™ 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 305109952 bytes (290 MB) / 839385088 bytes (800 MB) up to 954728448 bytes (910 MB)
JVM Flags: 1 total; -Xmx1024M
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
FML: MCP 9.42 Powered by Forge 14.23.5.2810 8 mods loaded, 8 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                                |
|:------ |:----------- |:------------------------ |:---------------------------------------- |:---------------------------------------- |
| LCHIJA | minecraft   | 1.12.2                   | minecraft.jar                            | None                                     |
| LCHIJA | mcp         | 9.42                     | minecraft.jar                            | None                                     |
| LCHIJA | FML         | 8.0.99.99                | forge.jar                                | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| LCHIJA | forge       | 14.23.5.2810             | forge.jar                                | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| LCHIJA | spongeapi   | 7.1.0-c386be07           | spongeforge-1.12.2-2768-7.1.6-RC3557.jar | None                                     |
| LCHIJA | sponge      | 1.12.2-7.1.6-SNAPSHOT    | spongeforge-1.12.2-2768-7.1.6-RC3557.jar | None                                     |
| LCHIJA | spongeforge | 1.12.2-2768-7.1.6-RC3557 | spongeforge-1.12.2-2768-7.1.6-RC3557.jar | None                                     |
| LCHIJA | pixelmon    | 7.0.1                    | Pixelmon-1.12.2-7.0.1-universal.jar      | None                                     |

Loaded coremods (and transformers): 

SpongeCoremod (spongeforge-1.12.2-2768-7.1.6-RC3557.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)

It looks like the level_sponge.dat file is corrupted. Reload it from backup or delete it if you don’t have one.

I made some changes in the latest SpongeForge version that should prevent the corruption from happening in the future. You’ll still need to reset the file, but once you do that and update I think it’ll happen much less often.

Devinchris03 let me know if u fixed it cuz im having the same issue