01:12:44 [SEVERE] Could not load 'plugins\MyPlugin.jar' in folder 'plugins':
java.lang.ClassNotFoundException: me.Fire_Head431.MyPackage
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:36)
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:24)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Unknown Source)
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:171)
        at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:215)
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:136)
        at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:151)
        at org.bukkit.craftbukkit.CraftServer.<init>(CraftServer.java:127)
        at net.minecraft.server.ServerConfigurationManager.<init>(ServerConfigurationManager.java:52)
        at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:145)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:399)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:457)