Making a Modpack Server

[Nyrab]

I recently created a modpack, but i can't connect to my friends via Hamachi, so i tried to make a server but it gaves an error that i don't understand

But in this topic i prefer start of the beggining, i need help to make a server or just a way that i can play with my friends via Hamachi

 

PS:I want a free way to make it, i tried Aternos but i didn't find some mods that was in my modpack

Edited June 17, 2019 by Nyrab