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java.lang.NullPointerException: 	at com.gmail.nossr50.mcMMO.onDisable(mcMMO.java:241)	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:294)	at org.bukkit.plugin.java.JavaPluginLoader.disablePlugin(JavaPluginLoader.java:347)	at org.bukkit.plugin.SimplePluginManager.disablePlugin(SimplePluginManager.java:447)	at com.gmail.nossr50.mcMMO.onEnable(mcMMO.java:195)	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:292)	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:319)	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:427)	at net.glowstone.GlowServer.enablePlugins(GlowServer.java:819)	at net.glowstone.GlowServer.start(GlowServer.java:482)	at net.glowstone.GlowServer.run(GlowServer.java:441)