Problem/Bug Plugin Won't Load??

I can't load this plugin i get this in my cmd file.
ould not load 'plugins\LorinthsRpgMobs1_8_9 (2).jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.NoClassDefFoundError: net/minecraft/server/v1_8_R3/World
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:135) ~[craftbukkit.jar:git-Spigot-870264a-0a645a2]
at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:329) ~[craftbukkit.jar:git-Spigot-870264a-0a645a2]
at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) [craftbukkit.jar:git-Spigot-870264a-0a645a2]
at org.bukkit.craftbukkit.v1_8_R2.CraftServer.loadPlugins(CraftServer.java:291) [craftbukkit.jar:git-Spigot-870264a-0a645a2]
at net.minecraft.server.v1_8_R2.DedicatedServer.init(DedicatedServer.java:199) [craftbukkit.jar:git-Spigot-870264a-0a645a2]
at net.minecraft.server.v1_8_R2.MinecraftServer.run(MinecraftServer.java:522) [craftbukkit.jar:git-Spigot-870264a-0a645a2]
at java.lang.Thread.run(Unknown Source) [?:1.7.0_55]
Caused by: java.lang.NoClassDefFoundError: net/minecraft/server/v1_8_R3/World
at java.lang.Class.forName0(Native Method) ~[?:1.7.0_55]
at java.lang.Class.forName(Unknown Source) ~[?:1.7.0_55]
at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:64) ~[craftbukkit.jar:git-Spigot-870264a-0a645a2]
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:131) ~[craftbukkit.jar:git-Spigot-870264a-0a645a2]
... 6 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.server.v1_8_R3.World
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:91) ~[craftbukkit.jar:git-Spigot-870264a-0a645a2]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[craftbukkit.jar:git-Spigot-870264a-0a645a2]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_55]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_55]
at java.lang.Class.forName0(Native Method) ~[?:1.7.0_55]
at java.lang.Class.forName(Unknown Source) ~[?:1.7.0_55]
at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:64) ~[craftbukkit.jar:git-Spigot-870264a-0a645a2]
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:131) ~[craftbukkit.jar:git-Spigot-870264a-0a645a2]
... 6 more
[18:16:54] [Server thread/INFO]:

 

Is this one you developed or one you downloaded?