Missing essentials library files?

[redmoogle]

every time i try to start my cauldron server it gives me this (im using bukkitgui v2)

 

 

7:40:21 AM [GUI] Starting server...

7:40:21 AM We appear to be missing one or more essential library files.

7:40:21 AM You will need to add them to your server before FML and Forge will run successfully.java.lang.ClassNotFoundException: net.minecraft.launchwrapper.Launch

7:40:21 AM at java.net.URLClassLoader.findClass(Unknown Source)

7:40:21 AM at java.lang.ClassLoader.loadClass(Unknown Source)

7:40:21 AM [GUI] The server has stopped

 

[redmoogle]

where should i go

[loordgek]

dies that does not work for me i get

Unable to connect

 

Firefox can't establish a connection to the server at 1.10.2.

how do i fix that trolololol