"Failed to synchronize registry data from server"

Hello, i need my help with Server
Today i created a server with a couple of mods to play with my Freind.
I installed all the Mods and sended him the Files

Wehn i try to connect to my server it works totally fine, but when my Freind treis to join the Message "Failed to synchronize registry data from server" pops up on his Screen we literally tried everthing for 4 hours and it still doesnt work, pls help

Quote from MattGold

Make sure they have the same mods and mod versions in the server as in their client.

My Freind has every same File just like me

Quote from Faze

Share your client log
1. Open your minecraft installation path
(enter %appdata%/.minecraft in the file explorer )
2. Open the logs folder
3. Open the "latest" or "latest.log" file with a text editor
4. Copy and paste the content of the file to https://mclo.gs/
5. Send the link here

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Already FIxed it but still thanks.