HELP! Opcode 2571 CHANNEL ERROR!

[defsec98]

Please Can anyone help me with this error!?

i can login into my server normally, but i send the client (with the ip's configured normally) for my friend, to test the server, and this error arose, please help!
PB THAID 2015 C# SERVER

 

[Wafflee]

update opcode's in source and build again

 

[defsec98]

But i don't have the source, i created server from this tutorial:
<br>