[20:04:22] [Server thread/ERROR]: Could not load 'plugins\MobDisguise.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.NoClassDefFoundError: net/minecraft/server/Packet
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:135) ~[craftbukkit.jar:git-Spigot-5f38d38-18fbb24]
	at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:329) ~[craftbukkit.jar:git-Spigot-5f38d38-18fbb24]
	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) [craftbukkit.jar:git-Spigot-5f38d38-18fbb24]
	at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugins(CraftServer.java:292) [craftbukkit.jar:git-Spigot-5f38d38-18fbb24]
	at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:198) [craftbukkit.jar:git-Spigot-5f38d38-18fbb24]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:525) [craftbukkit.jar:git-Spigot-5f38d38-18fbb24]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_66]
Caused by: java.lang.NoClassDefFoundError: net/minecraft/server/Packet
	at me.desmin88.mobdisguise.MobDisguise.<clinit>(MobDisguise.java:37) ~[?:?]
	at java.lang.Class.forName0(Native Method) ~[?:1.8.0_66]
	at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_66]
	at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:64) ~[craftbukkit.jar:git-Spigot-5f38d38-18fbb24]
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:131) ~[craftbukkit.jar:git-Spigot-5f38d38-18fbb24]
	... 6 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.server.Packet
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:91) ~[craftbukkit.jar:git-Spigot-5f38d38-18fbb24]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[craftbukkit.jar:git-Spigot-5f38d38-18fbb24]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_66]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_66]
	at me.desmin88.mobdisguise.MobDisguise.<clinit>(MobDisguise.java:37) ~[?:?]
	at java.lang.Class.forName0(Native Method) ~[?:1.8.0_66]
	at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_66]
	at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:64) ~[craftbukkit.jar:git-Spigot-5f38d38-18fbb24]
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:131) ~[craftbukkit.jar:git-Spigot-5f38d38-18fbb24]
	... 6 more