[1.21.1] ViaVersion not working

[unikub0]

when i use cardboard, this happens :

[10:05:42] [Server thread/INFO]: Enabling ViaVersion v5.3.3-SNAPSHOT
[10:05:42] [Server thread/FATAL]: Error occurred while enabling ViaVersion v5.3.3-SNAPSHOT (Is it up to date?)
java.lang.NoClassDefFoundError: Could not initialize class com.viaversion.viaversion.bukkit.util.NMSUtil
at com.viaversion.viaversion.bukkit.listeners.JoinListener.(JoinListener.java:48) ~[?:?]
at com.viaversion.viaversion.ViaVersionPlugin.onEnable(ViaVersionPlugin.java:104) ~[?:?]
at knot/org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:263) ~[Cardboard-1.21.jar:?]
at knot/org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:335) ~[Cardboard-1.21.jar:?]
at knot/org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:1520) ~[paper-api-1.21.1-R0.1-20241021.162528-124.jar:?]
at knot/org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:611) ~[Cardboard-1.21.jar:?]
at knot/org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:542) ~[Cardboard-1.21.jar:?]
at knot/net.minecraft.server.MinecraftServer.handler$zzd000$cardboard$afterWorldLoad(MinecraftServer.java:2790) ~[server-intermediary.jar:?]
at knot/net.minecraft.server.MinecraftServer.method_3735(MinecraftServer.java:357) ~[server-intermediary.jar:?]
at knot/net.minecraft.class_3176.method_3823(class_3176.java:185) ~[server-intermediary.jar:?]
at knot/net.minecraft.server.MinecraftServer.method_29741(MinecraftServer.java:664) ~[server-intermediary.jar:?]
at knot/net.minecraft.server.MinecraftServer.method_29739(MinecraftServer.java:281) ~[server-intermediary.jar:?]
at java.base/java.lang.Thread.run(Thread.java:1583) [?:?]
Caused by: java.lang.ExceptionInInitializerError: Exception java.lang.NullPointerException [in thread "Server thread"]
at java.base/java.lang.reflect.Method.invoke(Method.java:572) ~[?:?]
at com.viaversion.viaversion.bukkit.util.NMSUtil.loadDebugProperty(NMSUtil.java:33) ~[?:?]
at com.viaversion.viaversion.bukkit.util.NMSUtil.(NMSUtil.java:25) ~[?:?]
at com.viaversion.viaversion.bukkit.platform.BukkitViaInjector.getServerConnection(BukkitViaInjector.java:152) ~[?:?]
at com.viaversion.viaversion.bukkit.platform.BukkitViaInjector.isBinded(BukkitViaInjector.java:203) ~[?:?]
at com.viaversion.viaversion.ViaVersionPlugin.onLoad(ViaVersionPlugin.java:83) ~[?:?]
at knot/org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:529) ~[Cardboard-1.21.jar:?]
at knot/net.minecraft.class_3176.handler$zzb000$cardboard$init(class_3176.java:786) ~[server-intermediary.jar:?]
at knot/net.minecraft.class_3176.method_3823(class_3176.java:161) ~[server-intermediary.jar:?]
... 3 more

but it works with original Paper/Purpur

list plugins I've installed :

• ViaVersion

other mods I've installed :

• iCommon
• Fabric API

[Dyxux]

You can use ViaVersion (the fabric mod version) and ViaFabric and it will work but I got the same issue.

[pisaiah]

can confirm the ViaVersion fabric mod works on 1.21.10