Bukkit Server Console Error

Please help me,my bukkit server console send the error

Code:

12.12 00:35:28 [Multicraft] Starting server!
12.12 00:35:28 [Multicraft] Loaded config for "Mod: Craftbukkit"
12.12 00:35:28 [Multicraft] Updating eula.txt file
12.12 00:35:28 [Server] INFO We appear to be missing one or more essential library files.
12.12 00:35:28 [Server] INFO You will need to add them to your server before FML and Forge will run successfully.java.lang.ClassNotFoundException: net.minecraft.launchwrapper.Launch
12.12 00:35:28 [Server] INFO at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
12.12 00:35:28 [Server] INFO at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
12.12 00:35:28 [Server] INFO at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
12.12 00:35:28 [Server] INFO at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
12.12 00:35:28 [Server] INFO at java.lang.Class.forName0(Native Method)
12.12 00:35:28 [Server] INFO at java.lang.Class.forName(Class.java:348)
12.12 00:35:28 [Server] INFO at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.java:25)
12.12 00:35:28 [Server] INFO at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.java:12)
12.12 00:35:28 [Multicraft] Server shut down (starting)
12.12 00:35:28 [Multicraft] Restarting crashed server in 5 seconds
12.12 00:35:28 [Multicraft] Looks like a crash, check the server console. Return value: 1
12.12 00:35:28 [Multicraft] Server stopped