so I have bin seeying that people have problems with forgemod in launch.bat
what you need to do is:
1. delete the lib folder in your tekkit server folder.
2. download the server for hexxit.
3. copy the lib folder from hexxit and place it in the tekkit server folder.
4. doubble click launch.bat
It should all be working right now
(sorry for my bad english I am from the netterlands)