[14:30:49 INFO]: [InvSee++] Enabling InvSeePlusPlus v0.30.0
[14:30:49 ERROR]: Error occurred while enabling InvSeePlusPlus v0.30.0 (Is it up to date?)
java.lang.NoClassDefFoundError: net/minecraft/world/entity/player/EntityHuman
        at InvSee++.jar/com.janboerman.invsee.spigot.Impl_1_21_6.<init>(Setup.java:136) ~[InvSee++.jar:?]
        at InvSee++.jar/com.janboerman.invsee.spigot.SetupImpl.lambda$static$14(Setup.java:166) ~[InvSee++.jar:?]
        at InvSee++.jar/com.janboerman.invsee.spigot.Setup.setup(Setup.java:40) ~[InvSee++.jar:?]
        at InvSee++.jar/com.janboerman.invsee.spigot.InvseePlusPlus.onEnable(InvseePlusPlus.java:86) ~[InvSee++.jar:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:280) ~[paper-api-1.21.6-R0.1-SNAPSHOT.jar:?]
        at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:202) ~[paper-1.21.6.jar:1.21.6-7-40d5d31]
        at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109) ~[paper-1.21.6.jar:1.21.6-7-40d5d31]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:520) ~[paper-api-1.21.6-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:653) ~[paper-1.21.6.jar:1.21.6-7-40d5d31]
        at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:608) ~[paper-1.21.6.jar:1.21.6-7-40d5d31]
        at net.minecraft.server.MinecraftServer.loadWorld0(MinecraftServer.java:743) ~[paper-1.21.6.jar:1.21.6-7-40d5d31]
        at net.minecraft.server.MinecraftServer.loadLevel(MinecraftServer.java:488) ~[paper-1.21.6.jar:1.21.6-7-40d5d31]
        at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:280) ~[paper-1.21.6.jar:1.21.6-7-40d5d31]
        at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1163) ~[paper-1.21.6.jar:1.21.6-7-40d5d31]
        at net.minecraft.server.MinecraftServer.lambda$spin$2(MinecraftServer.java:310) ~[paper-1.21.6.jar:1.21.6-7-40d5d31]
        at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]
Caused by: java.lang.ClassNotFoundException: net.minecraft.world.entity.player.EntityHuman
        at org.bukkit.plugin.java.PluginClassLoader.loadClass0(PluginClassLoader.java:197) ~[paper-api-1.21.6-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.plugin.java.PluginClassLoader.loadClass(PluginClassLoader.java:164) ~[paper-api-1.21.6-R0.1-SNAPSHOT.jar:?]
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526) ~[?:?]
        ... 16 more
[14:30:49 INFO]: [InvSee++] Disabling InvSeePlusPlus v0.30.0