Strange error message with mod version

Hello,

Me and my friends are trying to play on the "Vault Hunters v3" modpack but when I try to connect an error appears.

As you can see the server ask me to have a mod version that is still installed. I do some researches that didn't help me. I hope you will able to bring me the solution. If you need more details please ask me.

Thank you.

I think that's not the case here

With new updates of the modpack that is soved. But now when I try to connect the server just say : took too long to log in. In the server log there is a handleDisconection() called twice. I dont know what it means