Bluemap on Fabric 1.21.6 refuses to load; crash on executing /bluemap

[InfiniteBed]

What i did / Steps to reproduce

Installed fabric server 1.21.6; bluemap latest version for 1.21.5

Expected result

The map would display and the command would run

Actual result

Crashes when running /bluemap

Context

BlueMap Version: bluemap-5.7-fabric for 1.21.5

crash-2025-06-18_08.24.37-server.txt

When starting the server:

[08:25:07] [BlueMap-Plugin-Loading/ERROR]: Uncaught exception in thread "BlueMap-Plugin-Loading"
java.lang.NoSuchMethodError: 'java.lang.String net.minecraft.class_6489.method_48018()'
	at knot/de.bluecolored.bluemap.fabric.FabricMod.getMinecraftVersion(FabricMod.java:141) ~[bluemap-5.7-fabric.jar:?]
	at knot/de.bluecolored.bluemap.common.plugin.Plugin.load(Plugin.java:132) ~[bluemap-5.7-fabric.jar:?]
	at knot/de.bluecolored.bluemap.common.plugin.Plugin.load(Plugin.java:114) ~[bluemap-5.7-fabric.jar:?]
	at knot/de.bluecolored.bluemap.fabric.FabricMod.lambda$onInitialize$2(FabricMod.java:109) ~[bluemap-5.7-fabric.jar:?]
	at java.base/java.lang.Thread.run(Thread.java:1583) [?:?]

When excuting /bluemap:

[08:24:37] [Server thread/ERROR]: Encountered an unexpected exception
java.lang.NoClassDefFoundError: net/minecraft/class_2561$class_2562
	at knot/de.bluecolored.bluemap.fabric.FabricCommandSource.sendMessage(FabricCommandSource.java:55) ~[bluemap-5.7-fabric.jar:?]
	at knot/de.bluecolored.bluemap.common.commands.Commands.checkPluginLoaded(Commands.java:154) ~[bluemap-5.7-fabric.jar:?]
	at knot/de.bluecolored.bluemap.common.commands.Commands.checkExecutablePreconditions(Commands.java:138) ~[bluemap-5.7-fabric.jar:?]
	at knot/de.bluecolored.bluemap.common.commands.CommandExecutor.execute(CommandExecutor.java:62) ~[bluemap-5.7-fabric.jar:?]
	at knot/de.bluecolored.bluemap.common.commands.BrigadierExecutionHandler.handle(BrigadierExecutionHandler.java:47) ~[bluemap-5.7-fabric.jar:?]
	at knot/de.bluecolored.bluecommands.brigadier.CommandCommand.run(CommandCommand.java:54) ~[bluemap-5.7-fabric.jar:?]
	at knot/com.mojang.brigadier.context.ContextChain.runExecutable(ContextChain.java:73) ~[brigadier-1.3.10.jar:?]
	at knot/net.minecraft.class_8865.method_54416(class_8865.java:29) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_8865.execute(class_8865.java:13) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_8856.method_54405(class_8856.java:8) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_8847.method_54388(class_8847.java:8) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_8854.method_54390(class_8854.java:107) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_2170.method_54313(class_2170.java:420) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_2170.method_9249(class_2170.java:350) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_3244.method_58590(class_3244.java:1528) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_3244.method_44356(class_3244.java:1516) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_3738.run(class_3738.java:18) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_1255.method_18859(class_1255.java:164) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_4093.method_18859(class_4093.java:23) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_24306(MinecraftServer.java:883) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_18859(MinecraftServer.java:179) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_1255.method_16075(class_1255.java:138) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_20415(MinecraftServer.java:865) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_16075(MinecraftServer.java:859) ~[server-intermediary.jar:?]
	at knot/net.minecraft.class_1255.method_18857(class_1255.java:147) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_18857(MinecraftServer.java:823) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_16208(MinecraftServer.java:830) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_29741(MinecraftServer.java:713) ~[server-intermediary.jar:?]
	at knot/net.minecraft.server.MinecraftServer.method_29739(MinecraftServer.java:291) ~[server-intermediary.jar:?]
	at java.base/java.lang.Thread.run(Thread.java:1583) [?:?]
Caused by: java.lang.ClassNotFoundException: net.minecraft.class_2561$class_2562
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641) ~[?:?]
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526) ~[?:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:226) ~[fabric-loader-0.16.14.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:119) ~[fabric-loader-0.16.14.jar:?]
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526) ~[?:?]
	... 30 more