[22:30:41 ERROR]: Error occurred while enabling Citizens v2.0.37-SNAPSHOT (build 3692) (Is it up to date?)
java.lang.NoClassDefFoundError: org/bukkit/craftbukkit/v1_21_R3/boss/CraftBossBar
        at Citizens-2.0.37-b3692 (1).jar/net.citizensnpcs.nms.v1_21_R3.util.NMSImpl.<clinit>(NMSImpl.java:2728) ~[Citizens-2.0.37-b3692 (1).jar:?]
        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-1.21.3.jar:1.21.3-82-5a60ffb]
        at Citizens-2.0.37-b3692 (1).jar/net.citizensnpcs.api.util.SpigotUtil.lambda$getMinecraftPackage$1(SpigotUtil.java:176) ~[Citizens-2.0.37-b3692 (1).jar:?]
        at Citizens-2.0.37-b3692 (1).jar/net.citizensnpcs.api.util.SpigotUtil.getMinecraftPackage(SpigotUtil.java:181) ~[Citizens-2.0.37-b3692 (1).jar:?]
        at Citizens-2.0.37-b3692 (1).jar/net.citizensnpcs.Citizens.onEnable(Citizens.java:326) ~[Citizens-2.0.37-b3692 (1).jar:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:288) ~[paper-api-1.21.3-R0.1-SNAPSHOT.jar:?]
        at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:202) ~[paper-1.21.3.jar:1.21.3-82-5a60ffb]
        at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109) ~[paper-1.21.3.jar:1.21.3-82-5a60ffb]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:520) ~[paper-api-1.21.3-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:655) ~[paper-1.21.3.jar:1.21.3-82-5a60ffb]
        at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:604) ~[paper-1.21.3.jar:1.21.3-82-5a60ffb]
        at net.minecraft.server.MinecraftServer.loadWorld0(MinecraftServer.java:768) ~[paper-1.21.3.jar:1.21.3-82-5a60ffb]
        at net.minecraft.server.MinecraftServer.loadLevel(MinecraftServer.java:530) ~[paper-1.21.3.jar:1.21.3-82-5a60ffb]
        at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:326) ~[paper-1.21.3.jar:1.21.3-82-5a60ffb]
        at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1235) ~[paper-1.21.3.jar:1.21.3-82-5a60ffb]
        at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:340) ~[paper-1.21.3.jar:1.21.3-82-5a60ffb]
        at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]
Caused by: java.lang.ClassNotFoundException: org.bukkit.craftbukkit.v1_21_R3.boss.CraftBossBar
        at org.bukkit.plugin.java.PluginClassLoader.loadClass0(PluginClassLoader.java:197) ~[paper-api-1.21.3-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.plugin.java.PluginClassLoader.loadClass(PluginClassLoader.java:164) ~[paper-api-1.21.3-R0.1-SNAPSHOT.jar:?]
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526) ~[?:?]
        ... 21 more
[22:30:41 INFO]: [Citizens] Disabling Citizens v2.0.37-SNAPSHOT (build 3692)