Erro no LaunchWrapper

Estou tendo um problema em meu servidor dedicado, eu instalei um modpack em meu servidor (modpack BlightFall) e toda vez que dou iniciar em meu servidor esse erro aparece:

08.10 14:15:54 [Multicraft] Server stopped
08.10 14:15:54 [Multicraft] Looks like a crash, check the server console. Return value: 1
08.10 14:15:52 [Multicraft] Stopping server!
08.10 14:15:52 [Multicraft] Not restarting crashed server.
08.10 14:15:52 [Multicraft] Server shut down (starting)
08.10 14:15:52 [Server] INFO at cpw.mods.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.java:12)
08.10 14:15:52 [Server] INFO at cpw.mods.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.java:25)
08.10 14:15:52 [Server] INFO at java.lang.Class.forName(Class.java:348)
08.10 14:15:52 [Server] INFO at java.lang.Class.forName0(Native Method)
08.10 14:15:52 [Server] INFO at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
08.10 14:15:52 [Server] INFO at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
08.10 14:15:52 [Server] INFO at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
08.10 14:15:52 [Server] INFO at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
08.10 14:15:52 [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
08.10 14:15:52 [Server] INFO We appear to be missing one or more essential library files.
08.10 14:15:52 [Multicraft] Updating eula.txt file
08.10 14:15:52 [Multicraft] Loaded config for "Avançado - Forge"
08.10 14:15:52 [Multicraft] Starting server!
08.10 14:15:52 [Multicraft] Loading server properties
08.10 14:15:52 [Multicraft] Received start command

Já tentei de tudo pra consertar o erro, movi a pasta onde está o LaunchWrapper, instalei ele em outros lugares do servidor FTP, reinstalei o modpack porém não consegui arrumar. Preciso de ajuda por favor