[17:09:57 ERROR]: Error occurred while enabling Citizens v2.0.39-SNAPSHOT (build 3894) (Is it up to date?)
java.lang.NoClassDefFoundError: net/minecraft/world/level/World
        at java.base/java.lang.Class.forName0(Native Method) ~[?:?]
        at java.base/java.lang.Class.forName(Class.java:534) ~[?:?]
        at java.base/java.lang.Class.forName(Class.java:513) ~[?:?]
        at io.papermc.reflectionrewriter.runtime.AbstractDefaultRulesReflectionProxy.forName(AbstractDefaultRulesReflectionProxy.java:68) ~[reflection-rewriter-runtime-0.0.3.jar:?]
        at io.papermc.paper.pluginremap.reflect.PaperReflectionHolder.forName(Unknown Source) ~[paper-1.21.8.jar:1.21.8-39-616a879]
        at Citizens-2.0.39-b3894.jar/net.citizensnpcs.api.util.SpigotUtil.lambda$getMinecraftPackage$1(SpigotUtil.java:174) ~[Citizens-2.0.39-b3894.jar:?]
        at Citizens-2.0.39-b3894.jar/net.citizensnpcs.api.util.SpigotUtil.getMinecraftPackage(SpigotUtil.java:179) ~[Citizens-2.0.39-b3894.jar:?]
        at Citizens-2.0.39-b3894.jar/net.citizensnpcs.Citizens.onEnable(Citizens.java:377) ~[Citizens-2.0.39-b3894.jar:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:280) ~[paper-api-1.21.8-R0.1-SNAPSHOT.jar:?]
        at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:202) ~[paper-1.21.8.jar:1.21.8-39-616a879]
        at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109) ~[paper-1.21.8.jar:1.21.8-39-616a879]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:520) ~[paper-api-1.21.8-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:652) ~[paper-1.21.8.jar:1.21.8-39-616a879]
        at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:608) ~[paper-1.21.8.jar:1.21.8-39-616a879]
        at net.minecraft.server.MinecraftServer.loadWorld0(MinecraftServer.java:743) ~[paper-1.21.8.jar:1.21.8-39-616a879]
        at net.minecraft.server.MinecraftServer.loadLevel(MinecraftServer.java:488) ~[paper-1.21.8.jar:1.21.8-39-616a879]
        at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:280) ~[paper-1.21.8.jar:1.21.8-39-616a879]
        at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1164) ~[paper-1.21.8.jar:1.21.8-39-616a879]
        at net.minecraft.server.MinecraftServer.lambda$spin$2(MinecraftServer.java:310) ~[paper-1.21.8.jar:1.21.8-39-616a879]
        at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]
Caused by: java.lang.ClassNotFoundException: net.minecraft.world.level.World
        at org.bukkit.plugin.java.PluginClassLoader.loadClass0(PluginClassLoader.java:205) ~[paper-api-1.21.8-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.plugin.java.PluginClassLoader.loadClass(PluginClassLoader.java:172) ~[paper-api-1.21.8-R0.1-SNAPSHOT.jar:?]
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526) ~[?:?]
        ... 20 more
[17:09:57 INFO]: [Citizens] Disabling Citizens v2.0.39-SNAPSHOT (build 3894)