Hi everyone that readd's this.
As I said in the title I'm making my first modded server. I've made servers before (never on my machine tho) and I've made modpacks but never both at the same time.
For this server I've put around 80 mods. It works in solo with the normal minecraft luncher. It's special because there is both forge and faric mod. I'm using sinytra connector to make it all work.
So I can play the modpack in solo but not get it to work on the server.
here are the latest logs : https://pastebin.com/fgsVpmZa
Thanks to everyone that will help me