It was intalled. I used modpack https://modrinth.com/modpack/ryan-cliffords-vr-expirence-2/versions

If Fabric API was installed on the client, but not Custom LAN, then it's probably a duplicate of #32, which still hasn't been fixed unfortunately, otherwise it's a new issue.

What combination of Fabric API and Custom LAN do you have installed on the server, and what—on the client (i.e. only Fabric API, only Custom LAN, both, neither)?

I have already changed my modpack, updated the factory and installed another mod for LAN. I do not wanto delve into this issue, just try to figure out for yourself why your mod causes such STRANGE reasons for kicking players

Only i can remember - it was latest mod version for 1.19.2

Are you sure it was installed on both the server (person who hosts the world) and client (person who joins it)? I installed the modpack and was able to replicate the issue (with the exact same error message), but only if I didn't install Custom LAN on the client, otherwise it works fine.

Modpack was installed on both

LAN mod was installed only for me

they must have Custom LAN installed

Stupidest mod i ever met. This is not better than hamachi. Only thing why i installed this mod - to specify port

Well, there you go. Closing as a duplicate of #32. Unfortunately, until that is fixed, if the client has Fabric API (Quilted or not), then they must have Custom LAN installed as well, even though this mod doesn't do anything on clients.
I was hoping it would have been fixed on the side of Fabric by now, but I guess I'll have to come up with a workaround…