[11:22:38 INFO]: [ViaVersion] ViaVersion is disabling, if this is a reload and y
ou experience issues consider rebooting.
[11:22:38 ERROR]: Could not load 'plugins\MCRealisticPlus.jar' in folder 'plugin
s'
org.bukkit.plugin.InvalidPluginException: java.lang.NoClassDefFoundError: org/bu
kkit/NamespacedKey
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.j
ava:135) ~[spigot-1.9.4.jar:git-Spigot-798f32d-0cd0397]
        at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.
java:329) ~[spigot-1.9.4.jar:git-Spigot-798f32d-0cd0397]
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager
.java:251) [spigot-1.9.4.jar:git-Spigot-798f32d-0cd0397]
        at org.bukkit.craftbukkit.v1_9_R2.CraftServer.loadPlugins(CraftServer.ja
va:297) [spigot-1.9.4.jar:git-Spigot-798f32d-0cd0397]
        at org.bukkit.craftbukkit.v1_9_R2.CraftServer.reload(CraftServer.java:74
4) [spigot-1.9.4.jar:git-Spigot-798f32d-0cd0397]
        at org.bukkit.Bukkit.reload(Bukkit.java:539) [spigot-1.9.4.jar:git-Spigo
t-798f32d-0cd0397]
        at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:
25) [spigot-1.9.4.jar:git-Spigot-798f32d-0cd0397]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:14
1) [spigot-1.9.4.jar:git-Spigot-798f32d-0cd0397]
        at org.bukkit.craftbukkit.v1_9_R2.CraftServer.dispatchCommand(CraftServe
r.java:646) [spigot-1.9.4.jar:git-Spigot-798f32d-0cd0397]
        at org.bukkit.craftbukkit.v1_9_R2.CraftServer.dispatchServerCommand(Craf
tServer.java:632) [spigot-1.9.4.jar:git-Spigot-798f32d-0cd0397]
        at net.minecraft.server.v1_9_R2.DedicatedServer.aL(DedicatedServer.java:
437) [spigot-1.9.4.jar:git-Spigot-798f32d-0cd0397]
        at net.minecraft.server.v1_9_R2.DedicatedServer.D(DedicatedServer.java:4
00) [spigot-1.9.4.jar:git-Spigot-798f32d-0cd0397]
        at net.minecraft.server.v1_9_R2.MinecraftServer.C(MinecraftServer.java:6
65) [spigot-1.9.4.jar:git-Spigot-798f32d-0cd0397]
        at net.minecraft.server.v1_9_R2.MinecraftServer.run(MinecraftServer.java
:564) [spigot-1.9.4.jar:git-Spigot-798f32d-0cd0397]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_144]
Caused by: java.lang.NoClassDefFoundError: org/bukkit/NamespacedKey
        at com.SamB440.MCRealisticPlus.AdvancementAPI.build(AdvancementAPI.java:
68) ~[?:?]
        at com.SamB440.MCRealisticPlus.Main.<init>(Main.java:80) ~[?:?]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
 ~[?:1.8.0_144]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
 ~[?:1.8.0_144]
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Sou
rce) ~[?:1.8.0_144]
        at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[?:1.8.0_1
44]
        at java.lang.Class.newInstance(Unknown Source) ~[?:1.8.0_144]
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.jav
a:76) ~[spigot-1.9.4.jar:git-Spigot-798f32d-0cd0397]
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.j
ava:131) ~[spigot-1.9.4.jar:git-Spigot-798f32d-0cd0397]
        ... 14 more
Caused by: java.lang.ClassNotFoundException: org.bukkit.NamespacedKey
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.
java:91) ~[spigot-1.9.4.jar:git-Spigot-798f32d-0cd0397]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.
java:86) ~[spigot-1.9.4.jar:git-Spigot-798f32d-0cd0397]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_144]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_144]
        at com.SamB440.MCRealisticPlus.AdvancementAPI.build(AdvancementAPI.java:
68) ~[?:?]
        at com.SamB440.MCRealisticPlus.Main.<init>(Main.java:80) ~[?:?]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
 ~[?:1.8.0_144]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
 ~[?:1.8.0_144]
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Sou
rce) ~[?:1.8.0_144]
        at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[?:1.8.0_1
44]
        at java.lang.Class.newInstance(Unknown Source) ~[?:1.8.0_144]
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.jav
a:76) ~[spigot-1.9.4.jar:git-Spigot-798f32d-0cd0397]
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.j
ava:131) ~[spigot-1.9.4.jar:git-Spigot-798f32d-0cd0397]
        ... 14 more