Question How to fix bad packet, are mods in use!?

[newrushb]

This problem happened recently. It didn't happen before
But I haven't made any changes to "Waterfall" recently
My console keeps flashing "bad packet, are mods in use!? Couldn't read all bytes from a packet. For more information, launch Waterfall with -Dwaterfall.packet-decode-logging=true"
Been brushing this spam, almost once a second

I am using "Waterfall" version #526

If I add "-Dwaterfall.packet-decode-logging=true" in start.bat
It will prompt this message: https://paste.gg/p/anonymous/bf6c014a07a6410aa55c154ea862cfde

I checked the information for two days and still can't solve this problem
please help me thanks

 

[newrushb]

My server doesn't have any mods
Because my server is a pure mini game server so 0mods

 

[electronicboy]

That error is the generic "something sent malformed packets", general advice is gonna be to start yanking plugins, etc

 

[newrushb]

That error is the generic "something sent malformed packets", general advice is gonna be to start yanking plugins, etc

But it is strange that I copied and pasted another copy and changed the port (25566), and the other copy did not report this problem. But this (25565) has been reporting this problem

I don't know how to solve it, can you help me? This problem has been bugging me for half a week

Please help me All in all thank you!