Version 1.5 is out and i completely fixed the Multiplayer issue 
i rewritten it to be handled using packets and it is now it works even without an item.
I also levitated the Hard dependency for ModularUI on the server so you can try and test the mod without having ModularUi present on the server at all! the thing is i could not test that unfortunently for myself so there is no guarantee it would work.
Here’s the changelog for v1.5.0:
* * fix CommonProxy being private (someone had an issue with this)
* + Update Modular UI to 2.0.8 (This will make the mod only run on this version!)
* * fix version name
* * disabled format checking, the only tests we need are hard error tests everything else passes
* * change energy usage to EU
* * dedicated server fix (rewrite to use packets instead of handlers this will also mean that we can migrate to non MUI stuff later or use commands instead of items and each scan is now unique)
* * Multiplayer is now fully functional
* + commands for openning GUI (experimental)
* * soft dep for ModularUI on server (experimental)
* * make it so water dosent cover Oil in Fluid Mode
also thanks to all the people who posted issues on github and helped me find these bugs 