Migrating from 1.21.11 to 26.1.1 unsuccessful

[TomPeppercorn]

Stack trace

https://mclo.gs/QpzaEqQ

Plugin and Datapack List

EssentialsX
EssentialsXAntiBuild
EssentialsXDiscord
GSit
LuckPerms
SimpleVoiceChat

Actions to reproduce (if known)

Run the Paper 26.1.1 build #18 .jar on a 1.21.11 world

Paper version

Unable to access.

Other

No response

[TomPeppercorn]

Last stack trace was invalid. Here's a new link, along with the raw output: https://mclo.gs/h2yfnzU

[TomPeppercorn]

[04:54:19] [ServerMain/INFO]: [bootstrap] Running Java 25 (OpenJDK 64-Bit Server VM 25.0.2+10-LTS; Eclipse Adoptium Temurin-25.0.2+10) on Linux 6.8.0-107-generic (amd64)
[04:54:19] [ServerMain/INFO]: [bootstrap] Loading Paper 26.1.1-18-dev/26.1@3d1da60 (2026-04-05T00:18:12Z) for Minecraft 26.1.1
[04:54:20] [ServerMain/INFO]: [PluginInitializerManager] Initializing plugins...
[04:54:21] [ServerMain/INFO]: [PluginInitializerManager] Initialized 6 plugins
[04:54:21] [ServerMain/INFO]: [PluginInitializerManager] Bukkit plugins (6):

• Essentials (2.22.0-dev+83-08b7fe3), EssentialsAntiBuild (2.22.0-dev+83-08b7fe3), EssentialsDiscord (2.22.0-dev+83-08b7fe3), GSit (3.3.1), LuckPerms (5.5.17), voicechat (2.6.15)
  [04:54:29] [ServerMain/INFO]: Environment: Environment[sessionHost=https://sessionserver.mojang.com, servicesHost=https://api.minecraftservices.com, profilesHost=https://api.mojang.com, name=PROD]
  [04:54:29] [ServerMain/INFO]: Starting upgrade for world "world"
  [04:54:30] [ServerMain/ERROR]: Failed to start the minecraft server
  java.util.concurrent.CompletionException: java.lang.NullPointerException: Cannot read field "unsupportedSettings" because the return value of "io.papermc.paper.configuration.GlobalConfiguration.get()" is null
  at java.base/java.util.concurrent.CompletableFuture.wrapInCompletionException(CompletableFuture.java:323) ~[?:?]
  at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:376) ~[?:?]
  at java.base/java.util.concurrent.CompletableFuture.uniApplyNow(CompletableFuture.java:695) ~[?:?]
  at java.base/java.util.concurrent.CompletableFuture.uniApplyStage(CompletableFuture.java:683) ~[?:?]
  at java.base/java.util.concurrent.CompletableFuture.thenApply(CompletableFuture.java:2227) ~[?:?]
  at net.minecraft.util.filefix.access.ChunkNbt.updateChunk(ChunkNbt.java:26) ~[paper-26.1.1.jar:26.1.1-18-3d1da60]
  at net.minecraft.util.filefix.fixes.LegacyStructureFileFix.storeLegacyStructureDataToChunks(LegacyStructureFileFix.java:212) ~[paper-26.1.1.jar:26.1.1-18-3d1da60]
  at net.minecraft.util.filefix.fixes.LegacyStructureFileFix.extractAndStoreLegacyStructureData(LegacyStructureFileFix.java:149) ~[paper-26.1.1.jar:26.1.1-18-3d1da60]
  at net.minecraft.util.filefix.fixes.LegacyStructureFileFix.lambda$makeFixer$4(LegacyStructureFileFix.java:93) ~[paper-26.1.1.jar:26.1.1-18-3d1da60]
  at net.minecraft.util.filefix.operations.ModifyContent.lambda$fix$0(ModifyContent.java:23) ~[paper-26.1.1.jar:26.1.1-18-3d1da60]
  at java.base/jdk.internal.vm.ScopedValueContainer.runWithoutScope(ScopedValueContainer.java:112) ~[?:?]
  at java.base/jdk.internal.vm.ScopedValueContainer.run(ScopedValueContainer.java:98) ~[?:?]
  at java.base/java.lang.ScopedValue$Carrier.run(ScopedValue.java:466) ~[?:?]
  at net.minecraft.util.filefix.operations.ModifyContent.fix(ModifyContent.java:21) ~[paper-26.1.1.jar:26.1.1-18-3d1da60]
  at net.minecraft.util.filefix.FileFix.runFixOperations(FileFix.java:52) ~[paper-26.1.1.jar:26.1.1-18-3d1da60]
  at net.minecraft.util.filefix.FileFixerUpper.applyFileFixers(FileFixerUpper.java:218) ~[paper-26.1.1.jar:26.1.1-18-3d1da60]
  at net.minecraft.util.filefix.FileFixerUpper.applyFileFixersOnCow(FileFixerUpper.java:197) ~[paper-26.1.1.jar:26.1.1-18-3d1da60]
  at net.minecraft.util.filefix.FileFixerUpper.startOrContinueFileFixing(FileFixerUpper.java:140) ~[paper-26.1.1.jar:26.1.1-18-3d1da60]
  at net.minecraft.util.filefix.FileFixerUpper.fix(FileFixerUpper.java:92) ~[paper-26.1.1.jar:26.1.1-18-3d1da60]
  at net.minecraft.util.filefix.FileFixerUpper.fix(FileFixerUpper.java:76) ~[paper-26.1.1.jar:26.1.1-18-3d1da60]
  at net.minecraft.server.Main.main(Main.java:207) ~[paper-26.1.1.jar:26.1.1-18-3d1da60]
  at io.papermc.paper.PaperBootstrap.boot(PaperBootstrap.java:21) ~[paper-26.1.1.jar:26.1.1-18-3d1da60]
  at org.bukkit.craftbukkit.Main.main(Main.java:234) ~[paper-26.1.1.jar:26.1.1-18-3d1da60]
  at io.papermc.paperclip.Paperclip.lambda$main$0(Paperclip.java:42) ~[?:?]
  at java.base/java.lang.Thread.run(Thread.java:1474) ~[?:?]
  Caused by: java.lang.NullPointerException: Cannot read field "unsupportedSettings" because the return value of "io.papermc.paper.configuration.GlobalConfiguration.get()" is null
  at net.minecraft.world.level.chunk.storage.RegionFileVersion.getCompressionFormat(RegionFileVersion.java:54) ~[paper-26.1.1.jar:26.1.1-18-3d1da60]
  at net.minecraft.world.level.chunk.storage.RegionFile.(RegionFile.java:423) ~[paper-26.1.1.jar:26.1.1-18-3d1da60]
  at net.minecraft.world.level.chunk.storage.RegionFileStorage.moonrise$getRegionFileIfExists(RegionFileStorage.java:127) ~[paper-26.1.1.jar:26.1.1-18-3d1da60]
  at net.minecraft.world.level.chunk.storage.RegionFileStorage.getRegionFile(RegionFileStorage.java:279) ~[paper-26.1.1.jar:26.1.1-18-3d1da60]
  at net.minecraft.world.level.chunk.storage.RegionFileStorage.read(RegionFileStorage.java:349) ~[paper-26.1.1.jar:26.1.1-18-3d1da60]
  at net.minecraft.world.level.chunk.storage.SimpleRegionStorage.read(SimpleRegionStorage.java:50) ~[paper-26.1.1.jar:26.1.1-18-3d1da60]
  at net.minecraft.util.filefix.access.ChunkNbt.updateChunk(ChunkNbt.java:25) ~[paper-26.1.1.jar:26.1.1-18-3d1da60]
  ... 19 more

[Doc94]

Hi, you can share the word before the migration?

looks like in the chunk upgrade Paper try to call in Vanilla a RegionFileVersion#getCompressionFormat() where try to call Paper Global Config but in that step that thing was not initiated.

[tehbeard]

I've encountered the same error.

If I can replicate it with zero plugins (Have only tried with a restore with all our plugins + data, and swapping the 26.1.1 build #20 jar in), I'll get the world we've got uploaded and provide a link here.

[tehbeard]

@Doc94

Link to the world files + server.properties https://drive.google.com/file/d/1aZ7jjT4f4PRnsP8pqT-GUL9AdCaqUXJY/view?usp=sharing

Tried with paper-26.1.1-20.jar and paper-26.1.1-24.jar on both Windows 10 and Pop_OS 22.04 (Ubuntu based)

Both produce the same NullPointerException for "unsupportedSettings" as detailed below:

[20:14:29 INFO]: [bootstrap] Running Java 25 (OpenJDK 64-Bit Server VM 25.0.2+10-Ubuntu-122.04; Ubuntu null) on Linux 6.17.9-76061709-generic (amd64)
[20:14:29 INFO]: [bootstrap] Loading Paper 26.1.1-24-dev/26.1@c53ac8a (2026-04-05T18:50:48Z) for Minecraft 26.1.1
[20:14:30 INFO]: [PluginInitializerManager] Initializing plugins...
[20:14:30 INFO]: [PluginInitializerManager] Initialized 0 plugins
WARNING: A terminally deprecated method in sun.misc.Unsafe has been called
WARNING: sun.misc.Unsafe::objectFieldOffset has been called by org.joml.MemUtil$MemUtilUnsafe (file:/pool/media/backups/26.1-min/libraries/org/joml/joml/1.10.8/joml-1.10.8.jar)
WARNING: Please consider reporting this to the maintainers of class org.joml.MemUtil$MemUtilUnsafe
WARNING: sun.misc.Unsafe::objectFieldOffset will be removed in a future release
[20:14:34 INFO]: Environment: Environment[sessionHost=https://sessionserver.mojang.com, servicesHost=https://api.minecraftservices.com, profilesHost=https://api.mojang.com, name=PROD]
[20:14:35 INFO]: Starting upgrade for world "hub"
[20:14:35 ERROR]: Failed to start the minecraft server
java.util.concurrent.CompletionException: java.lang.NullPointerException: Cannot read field "unsupportedSettings" because the return value of "io.papermc.paper.configuration.GlobalConfiguration.get()" is null
        at java.base/java.util.concurrent.CompletableFuture.wrapInCompletionException(CompletableFuture.java:323) ~[?:?]
        at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:376) ~[?:?]
        at java.base/java.util.concurrent.CompletableFuture.uniApplyNow(CompletableFuture.java:695) ~[?:?]
        at java.base/java.util.concurrent.CompletableFuture.uniApplyStage(CompletableFuture.java:683) ~[?:?]
        at java.base/java.util.concurrent.CompletableFuture.thenApply(CompletableFuture.java:2227) ~[?:?]
        at net.minecraft.util.filefix.access.ChunkNbt.updateChunk(ChunkNbt.java:26) ~[paper-26.1.1.jar:26.1.1-24-c53ac8a]
        at net.minecraft.util.filefix.fixes.LegacyStructureFileFix.storeLegacyStructureDataToChunks(LegacyStructureFileFix.java:212) ~[paper-26.1.1.jar:26.1.1-24-c53ac8a]
        at net.minecraft.util.filefix.fixes.LegacyStructureFileFix.extractAndStoreLegacyStructureData(LegacyStructureFileFix.java:149) ~[paper-26.1.1.jar:26.1.1-24-c53ac8a]
        at net.minecraft.util.filefix.fixes.LegacyStructureFileFix.lambda$makeFixer$4(LegacyStructureFileFix.java:93) ~[paper-26.1.1.jar:26.1.1-24-c53ac8a]
        at net.minecraft.util.filefix.operations.ModifyContent.lambda$fix$0(ModifyContent.java:23) ~[paper-26.1.1.jar:26.1.1-24-c53ac8a]
        at java.base/jdk.internal.vm.ScopedValueContainer.runWithoutScope(ScopedValueContainer.java:112) ~[?:?]
        at java.base/jdk.internal.vm.ScopedValueContainer.run(ScopedValueContainer.java:98) ~[?:?]
        at java.base/java.lang.ScopedValue$Carrier.run(ScopedValue.java:466) ~[?:?]
        at net.minecraft.util.filefix.operations.ModifyContent.fix(ModifyContent.java:21) ~[paper-26.1.1.jar:26.1.1-24-c53ac8a]
        at net.minecraft.util.filefix.FileFix.runFixOperations(FileFix.java:52) ~[paper-26.1.1.jar:26.1.1-24-c53ac8a]
        at net.minecraft.util.filefix.FileFixerUpper.applyFileFixers(FileFixerUpper.java:218) ~[paper-26.1.1.jar:26.1.1-24-c53ac8a]
        at net.minecraft.util.filefix.FileFixerUpper.applyFileFixersOnCow(FileFixerUpper.java:197) ~[paper-26.1.1.jar:26.1.1-24-c53ac8a]
        at net.minecraft.util.filefix.FileFixerUpper.startOrContinueFileFixing(FileFixerUpper.java:140) ~[paper-26.1.1.jar:26.1.1-24-c53ac8a]
        at net.minecraft.util.filefix.FileFixerUpper.fix(FileFixerUpper.java:92) ~[paper-26.1.1.jar:26.1.1-24-c53ac8a]
        at net.minecraft.util.filefix.FileFixerUpper.fix(FileFixerUpper.java:76) ~[paper-26.1.1.jar:26.1.1-24-c53ac8a]
        at net.minecraft.server.Main.main(Main.java:207) ~[paper-26.1.1.jar:26.1.1-24-c53ac8a]
        at io.papermc.paper.PaperBootstrap.boot(PaperBootstrap.java:21) ~[paper-26.1.1.jar:26.1.1-24-c53ac8a]
        at org.bukkit.craftbukkit.Main.main(Main.java:234) ~[paper-26.1.1.jar:26.1.1-24-c53ac8a]
        at io.papermc.paperclip.Paperclip.lambda$main$0(Paperclip.java:42) ~[?:?]
        at java.base/java.lang.Thread.run(Thread.java:1474) ~[?:?]
Caused by: java.lang.NullPointerException: Cannot read field "unsupportedSettings" because the return value of "io.papermc.paper.configuration.GlobalConfiguration.get()" is null
        at net.minecraft.world.level.chunk.storage.RegionFileVersion.getCompressionFormat(RegionFileVersion.java:54) ~[paper-26.1.1.jar:26.1.1-24-c53ac8a]
        at net.minecraft.world.level.chunk.storage.RegionFile.<init>(RegionFile.java:423) ~[paper-26.1.1.jar:26.1.1-24-c53ac8a]
        at net.minecraft.world.level.chunk.storage.RegionFileStorage.moonrise$getRegionFileIfExists(RegionFileStorage.java:127) ~[paper-26.1.1.jar:26.1.1-24-c53ac8a]
        at net.minecraft.world.level.chunk.storage.RegionFileStorage.getRegionFile(RegionFileStorage.java:279) ~[paper-26.1.1.jar:26.1.1-24-c53ac8a]
        at net.minecraft.world.level.chunk.storage.RegionFileStorage.read(RegionFileStorage.java:349) ~[paper-26.1.1.jar:26.1.1-24-c53ac8a]
        at net.minecraft.world.level.chunk.storage.SimpleRegionStorage.read(SimpleRegionStorage.java:50) ~[paper-26.1.1.jar:26.1.1-24-c53ac8a]
        at net.minecraft.util.filefix.access.ChunkNbt.updateChunk(ChunkNbt.java:25) ~[paper-26.1.1.jar:26.1.1-24-c53ac8a]
        ... 19 more

edit: From discussion with server staff, we believe this world may have originally been created in 1.12 / 1.13 and has been running since as our creative flat world / hub to other servers.

[YourMJK]

Having the same issue with the latest alpha build (paper-26.1.1-29).

Clean install, no config, no plugins. Getting the exact same stack trace as @tehbeard above.

My world started in MC alpha and went through every major release (latest being Paper 1.21.11), including some Spigot versions.
I trimmed it and uploaded the world folders here:
https://drive.google.com/file/d/1W5Xkp3uLECN_A_z_xFvXnNCSW6lZ8RTH/

[andrewkm]

Same issue happening here. Paper 26.1.1-29.

[andrewkm]

If you're stuck on this just pre-upgrade your world with the vanilla 26.1.1 server. Drop the vanilla server.jar in a temp folder, set level-name to the world you're working with and run it with --forceUpgrade nogui, let it finish and move world back. Vanilla dont depend on GlobalConfiguration during the file-fixer pass so it just migrates the legacy shit cleanly and paper boots. All is good.