What does this error mean?

[Safdar]

When I try joining my server, it says Internal Exception: io.netty.handler.codec.DecoderException: java.io.IOException: Bad packet id 71

This shows up for me only when I join my server. I haven't joined it before, neither had anyone else. And only one server shows an error in the console for having a wrong port, is that the reason for this?
Thank you.

EDIT: I turned off the server which is the only one showing the error, but still the same message shows up when I try joining.

 

[Hannes]

Got the same jar on all of them?

 

[Christopher]

I'm no expert, but

Bad packet

Sounds like a network problem.

Do you host the server yourself, or?

 

[Safdar]

Got the same jar on all of them?

What do you mean? The Bungeecord and Spigot jars are same on all of them, I think the error is caused becase, I downloaded a pre made bungeecord server, I replaced the spigot.jars and bungeecord.jar with a 1.7x 1.8x version as it was only 1.8 compatible. I also added an extra server into it, which the console detected an error from, so I removed it, but still the same message.

I'm no expert, but

Sounds like a network problem.

Do you host the server yourself, or?

I host it on my laptop.

 

[Hannes]

What do you mean? The Bungeecord and Spigot jars are same on all of them, I think the error is caused becase, I downloaded a pre made bungeecord server, I replaced the spigot.jars and bungeecord.jar with a 1.7x 1.8x version as it was only 1.8 compatible. I also added an extra server into it, which the console detected an error from, so I removed it, but still the same message.

I host it on my laptop.

Someone said that the error is because you're joining with the wrong version, don't quote me on that though.

 

[Safdar]

Someone said that the error is because you're joining with the wrong version, don't quote me on that though.

Can you tell me who is that? What have I done wrong?
I think the best thing would be start over again, it's not much tbh.

 

[Hannes]

Can you tell me who is that? What have I done wrong?
I think the best thing would be start over again, it's not much tbh.

http://bfy.tw/EDn7

 

[Safdar]

http://bfy.tw/EDn7

Wow, how did you do that?

 

[Hannes]

Wow, how did you do that?

https://lmgtfy.com/ haha.