Server problem - imbis core ID error?

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I have a multiplay minecraft server (small server just for me and a couple friends), took me a while to get it working - ive never run a server before, but i have it sorted now. been playing on the technic launcher hexxit, volz and now trying to play tekkit, but it comes up with an error when i try to play on it - my single player works fine. I think it's a problem with the ID for imbis being the same as something else but im probably wrong. we've tried looking online for patches or fixes but couldnt find anything - if anyone has had this problem tell me please if you know how to fix it or if i should just go back and try a different mod pack, we've always wanted to play tekkit so it would be a shame please help

 

This is what appears when i try to play on my server

 

Forge Mod Loader has found ID mismatches

Complete Details are in the log file

ID 13782 from Mod ImbisCore is missing

ID 960 from Mod ImbisCore is missing

ID 1439 from Mod ImbisCore is missing

 

You cannot connect to this server

 

I tried updating the mod but now it has a different error due to the server not having an as updated version of the pack

 

Help much appreciated! (hlep plez)