Server crash

heres the crash:
[25.09 12:05:52] [Multicraft] Received start command
[25.09 12:05:52] [Multicraft] Loading server properties
[25.09 12:05:52] [Multicraft] Starting server!
[25.09 12:05:52] [Multicraft] Loaded config for "Forge 1.7.10 Recommended 10.13.4.1558"
[25.09 12:05:53] [Multicraft] Updating eula.txt file
[25.09 12:05:53] [Server] We appear to be missing one or more essential library files.
[25.09 12:05:53] [Server] You will need to add them to your server before FML and Forge will run successfully.java.lang.ClassNotFoundExceptionnet.minecraft.launchwrapper.Launch
[25.09 12:05:53] [Server] at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
[25.09 12:05:53] [Server] at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
[25.09 12:05:53] [Server] at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)
[25.09 12:05:53] [Server] at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
[25.09 12:05:53] [Server] at java.lang.Class.forName0(Native Method)
[25.09 12:05:53] [Server] at java.lang.Class.forName(Class.java:348)
[25.09 12:05:53] [Server] at cpw.mods.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.java:25)
[25.09 12:05:53] [Server] at cpw.mods.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.java:12)
[25.09 12:05:53] [Multicraft] Server shut down (starting)
[25.09 12:05:53] [Multicraft] Restarting crashed server in 5 seconds
[25.09 12:05:53] [Multicraft] Stopping server!
[25.09 12:05:55] [Multicraft] Received start command
[25.09 12:05:55] [Multicraft] Server currently stopping, ignoring start command
[25.09 12:05:56] [Multicraft] Looks like a crash, check the server console. Return value: 1
[25.09 12:05:56] [Multicraft] Server stopped