[19:07:05 ERROR]: Could not load 'plugins\EnableMessage.jar' in folder 'plugins'

org.bukkit.plugin.InvalidPluginException: java.lang.ClassNotFoundException: nl.t
imdebrouwer.enablemessage.EnableMessage
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.j
ava:184) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.
java:308) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager
.java:231) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at org.bukkit.craftbukkit.v1_7_R1.CraftServer.loadPlugins(CraftServer.ja
va:255) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at org.bukkit.craftbukkit.v1_7_R1.CraftServer.reload(CraftServer.java:62
8) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at org.bukkit.Bukkit.reload(Bukkit.java:279) [craftbukkit.jar:git-Bukkit
-1.7.2-R0.2-b2974jnks]
        at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:
23) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:19
6) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at org.bukkit.craftbukkit.v1_7_R1.CraftServer.dispatchCommand(CraftServe
r.java:542) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at org.bukkit.craftbukkit.v1_7_R1.CraftServer.dispatchServerCommand(Craf
tServer.java:529) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at net.minecraft.server.v1_7_R1.DedicatedServer.aw(DedicatedServer.java:
286) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:2
51) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:5
45) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java
:457) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:6
17) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
Caused by: java.lang.ClassNotFoundException: nl.timdebrouwer.enablemessage.Enabl
eMessage
        at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.7.0_51]
        at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.7.0_51]
        at java.security.AccessController.doPrivileged(Native Method) ~[?:1.7.0_
51]
        at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.7.0_51]
        at org.bukkit.plugin.java.PluginClassLoader.findClass0(PluginClassLoader
.java:80) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.
java:53) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_51]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_51]
        at java.lang.Class.forName0(Native Method) ~[?:1.7.0_51]
        at java.lang.Class.forName(Unknown Source) ~[?:1.7.0_51]
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.j
ava:173) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        ... 14 more