[13:29:37] [Server thread/ERROR]: Could not load 'plugins\EnderdragonsPlus.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.NoClassDefFoundError: net/minecraft/server/v1_7_R2/EntityEnderDragon
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:133) ~[spigot.jar:git-Spigot-1627]
	at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:329) ~[spigot.jar:git-Spigot-1627]
	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) [spigot.jar:git-Spigot-1627]
	at org.bukkit.craftbukkit.v1_7_R4.CraftServer.loadPlugins(CraftServer.java:369) [spigot.jar:git-Spigot-1627]
	at net.minecraft.server.v1_7_R4.DedicatedServer.init(DedicatedServer.java:152) [spigot.jar:git-Spigot-1627]
	at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:458) [spigot.jar:git-Spigot-1627]
	at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [spigot.jar:git-Spigot-1627]
Caused by: java.lang.NoClassDefFoundError: net/minecraft/server/v1_7_R2/EntityEnderDragon
	at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.7.0_67]
	at java.lang.ClassLoader.defineClass(Unknown Source) ~[?:1.7.0_67]
	at java.security.SecureClassLoader.defineClass(Unknown Source) ~[?:1.7.0_67]
	at java.net.URLClassLoader.defineClass(Unknown Source) ~[?:1.7.0_67]
	at java.net.URLClassLoader.access$100(Unknown Source) ~[?:1.7.0_67]
	at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.7.0_67]
	at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.7.0_67]
	at java.security.AccessController.doPrivileged(Native Method) ~[?:1.7.0_67]
	at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.7.0_67]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:101) ~[spigot.jar:git-Spigot-1627]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[spigot.jar:git-Spigot-1627]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_67]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_67]
	at de.tobiyas.enderdragonsplus.EnderdragonsPlus.<init>(EnderdragonsPlus.java:109) ~[?:?]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.7.0_67]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.7.0_67]
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.7.0_67]
	at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[?:1.7.0_67]
	at java.lang.Class.newInstance(Unknown Source) ~[?:1.7.0_67]
	at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:76) ~[spigot.jar:git-Spigot-1627]
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) ~[spigot.jar:git-Spigot-1627]
	... 6 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.server.v1_7_R2.EntityEnderDragon
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:91) ~[spigot.jar:git-Spigot-1627]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[spigot.jar:git-Spigot-1627]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_67]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_67]
	at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.7.0_67]
	at java.lang.ClassLoader.defineClass(Unknown Source) ~[?:1.7.0_67]
	at java.security.SecureClassLoader.defineClass(Unknown Source) ~[?:1.7.0_67]
	at java.net.URLClassLoader.defineClass(Unknown Source) ~[?:1.7.0_67]
	at java.net.URLClassLoader.access$100(Unknown Source) ~[?:1.7.0_67]
	at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.7.0_67]
	at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.7.0_67]
	at java.security.AccessController.doPrivileged(Native Method) ~[?:1.7.0_67]
	at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.7.0_67]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:101) ~[spigot.jar:git-Spigot-1627]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[spigot.jar:git-Spigot-1627]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_67]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_67]
	at de.tobiyas.enderdragonsplus.EnderdragonsPlus.<init>(EnderdragonsPlus.java:109) ~[?:?]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.7.0_67]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.7.0_67]
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.7.0_67]
	at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[?:1.7.0_67]
	at java.lang.Class.newInstance(Unknown Source) ~[?:1.7.0_67]
	at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:76) ~[spigot.jar:git-Spigot-1627]
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) ~[spigot.jar:git-Spigot-1627]
	... 6 more