10:21:20 [SEVERE] Error occurred while enabling Runecraft v0.4 (Is it up to date
?): tried to access field rmm.self from class Runecraft
java.lang.IllegalAccessError: tried to access field rmm.self from class Runecraf
t
        at Runecraft.onEnable(Unknown Source)
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:126)
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader
.java:892)
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManage
r.java:278)
        at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:173)
        at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:156
)
        at net.minecraft.server.MinecraftServer.e(MinecraftServer.java:297)
        at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:284)
        at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:152)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:348)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:417)