WTF StackTrace...

12:55:09 [SEVERE] Could not load 'plugins\AcuddlyTrading.jar' in folder 'plugins':
java.lang.NoClassDefFoundError: org/getspout/spoutapi/gui/Widget
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Unknown Source)
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:170)
        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:136)
        at org.bukkit.craftbukkit.CraftServer.reload(CraftServer.java:411)
        at org.bukkit.Bukkit.reload(Bukkit.java:182)
        at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:22)
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:163)
        at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:355)
        at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:351)
        at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:506)
        at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:485)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:374)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:417)
Caused by: java.lang.ClassNotFoundException: org.getspout.spoutapi.gui.Widget
        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)
        ... 16 more