Players can no longer join the server

[destroyboot]

Hello,

 

I am hosting a modded Forge server (31.1.16) and after some time, me and my friend can no longer join. The world loads, but after a second we are disconnected and the server console shows the erros below (for both players the same). Everything went smoothly until (I guess) when I made myself an op via server console. Now neither me nor my friend are able to connect. I have tried deop'ing myself, deleting ops.json and restarting server, but no luck. This sutiation has happened before with another world, and I am pretty sure I have also used op command then (did not think of this as a cause then).

 

We are both using Twitch client to start minecraft if that has anything to do with it.

 

I am also attaching latest logs.

Debug: https://paste.gg/p/anonymous/ec77e04387194b67832a1cf2c6a28a45

Latest "normal" log: https://paste.gg/p/anonymous/c650429d068742cd831b329a70806456

Client log: https://paste.gg/p/anonymous/c0659c180a5c4b758892cb6396b87989

 

Any help is greatly appreciated

 

[Netty Epoll Server IO #1/ERROR] inecraft/ArgumentTypes]: Could not serialize net.minecraftforge.server.command.ModIdArgument@1f13015b (class net.minecraftforge.server.command.ModIdArgument) - will not be sent to client!
[Netty Epoll Server IO #1/ERROR] inecraft/ArgumentTypes]: Could not serialize net.minecraftforge.server.command.EnumArgument@26cf673b (class net.minecraftforge.server.command.EnumArgument) - will not be sent to client!

 

Edited March 12, 2020 by destroyboot
Adding client log

[destroyboot]

Of course. I have edited my original post to also include client log.

[destroyboot]

I am attaching the log before the one I posted above (which was called: latest): https://paste.gg/p/anonymous/9f59809953ac427f8ac2b5a6495b877e

 

Generally what happens is: the world loads, but you cannot do anything except walking as "you are already disconnected", then you are disconnected with an error saying that the host disconnected you.