Modpack Server always kicking players

[CptPICHU]

Hey there.

 

I am creating a modpack right now. It included 104 Mods for 1.16.4

The Pack launches just fine and working very nicely.

 

However, a server including all of this does launch, but throws a lot of errors and when connecting to it,

everyone just can't. And there is always this very helpful error message:

 

[Netty Epoll Server IO #2/ERROR] [minecraft/NettyPacketEncoder]: java.lang.NullPointerException

 

Without any mods, the Server launches perfectly and everyone can connect just fine so the server setup might not be the issue.

What am i supposed to do here? This looks very upsetting to me because i really have no clue what this error message even means.

 

You can take a look at log here: https://pastebin.com/x3bGbHa5

 

I hope someone has an idea what is going on...

[CptPICHU]

Additional info:

 

https://pastebin.com/dGKb70Be

 

This might give some more info. Its the Minecraft Log itself.

[CptPICHU]

Oof. I solved it. For those who wanna know:

I tried every single mod. There were some little incompatibilities that needed to be fixed.

What exactly causes this error must be most likely tested out i guess...