failed to synchronize registry data from server closing connection. [1.16.4][Server][Modded]

[Veo]

Hey, I'm trying to host a modded forge server for me and my friends. We made a custom Modpack per CursedForge.

Everything worked fine until I changed some mods, but nothing I've tried so far helped. Everytime I try to join the server I get the "Failed to synchronize registry data from server closing connection."
 The Server gives me: " [Server thread/INFO] [minecraft/ServerLoginNetHandler]: com.mojang.authlib.GameProfile@34a0dd79[id=17de6071-8fd1-4a9a-bb33-b85e27244f29,name=VeoSpielt,properties={textures=[com.mojang.authlib.properties.Property@26b7a6fb]},legacy=false] (/25.100.177.16:53183) lost connection: Disconnected".

server logs:
latest server log

debug.log
 

[Veo]

57 minutes ago, diesieben07 said:

You need to post the debug.log from client as well.

oh mb

client log:
latest.log

that's the only log I found here:  

[Veo]

1 hour ago, diesieben07 said:

The log does not match up with the server log.

The server log shows a login attempt at [10Jan2021 15:03:52.014] . The client log only starts at [16:11:24] (so even different time zones cannot account for this).

The client log also does not show any attempts to connect to any server.

damn it, sorry. 

server-log

server-debug

client-log

[Veo]

Thanks allot, now everything works!
and I learned something too.