What i did / Steps to reproduce

1. run the server and bluemap on it
2. execute /bluemap force-update world or bluemap update world
3. end

Expected result

start update world

Actual result

displays an error:

bluemap force-update world
[17:00:01 ERROR]: Thread BlueMap-Plugin-UpdateCommand failed main thread check: world save
java.lang.Throwable: null
at org.spigotmc.AsyncCatcher.catchOp(AsyncCatcher.java:14) ~[paper-1.20.4.jar:git-Paper-485]
at org.bukkit.craftbukkit.v1_20_R3.CraftWorld.save(CraftWorld.java:1316) ~[paper-1.20.4.jar:git-Paper-485]
at de.bluecolored.bluemap.bukkit.BukkitWorld.persistWorldChanges(BukkitWorld.java:74) ~[BlueMap-4.1-paper.jar:?]
at de.bluecolored.bluemap.common.plugin.Plugin.flushWorldUpdates(Plugin.java:573) ~[BlueMap-4.1-paper.jar:?]
at de.bluecolored.bluemap.common.plugin.commands.Commands.lambda$updateCommand$16(Commands.java:742) ~[BlueMap-4.1-paper.jar:?]
at java.lang.Thread.run(Thread.java:842) ~[?:?]
[17:00:01 WARN]: Exception in thread "BlueMap-Plugin-UpdateCommand" java.lang.IllegalStateException: Asynchronous world save!
[17:00:01 WARN]: at org.spigotmc.AsyncCatcher.catchOp(AsyncCatcher.java:15)
[17:00:01 WARN]: at org.bukkit.craftbukkit.v1_20_R3.CraftWorld.save(CraftWorld.java:1316)
[17:00:01 WARN]: at BlueMap-4.1-paper.jar//de.bluecolored.bluemap.bukkit.BukkitWorld.persistWorldChanges(BukkitWorld.java:74)
[17:00:01 WARN]: at BlueMap-4.1-paper.jar//de.bluecolored.bluemap.common.plugin.Plugin.flushWorldUpdates(Plugin.java:573)
[17:00:01 WARN]: at BlueMap-4.1-paper.jar//de.bluecolored.bluemap.common.plugin.commands.Commands.lambda$updateCommand$16(Commands.java:742)
[17:00:01 WARN]: at java.base/java.lang.Thread.run(Thread.java:842)

Context

• BlueMap-4.1-paper.jar send an error
• BlueMap-4.1-spigot.jar no problem run a commend
• paper-1.20.4-485.jar
• purpur-1.20.4-2171.jar
• use default config server and plugin
• plugin only edit setting accept-download: true

Thanks for reporting this bug!

This is a bug that has already been fixed in a0e9180.
The fix just hasn't been released yet.

If you accept a potentially unstable experience (even more unstable than snapshots or pre-releases), then you can try using the latest development build of BlueMap:

1. Make sure you're logged into your GitHub account
2. Then you can go to this link: https://github.com/BlueMap-Minecraft/BlueMap/actions
3. Open the newest successful Build workflow run (Click the top one that has a ✅ next to it)
4. Then scroll down until you see "artifacts"
5. Download it to get a zip full of BlueMap jars
6. Extract the one for your platform, and use that instead of the version you're using right now

okey thanks