response error after connection causes conclusion 6401 127.0.0.1

[itaialroy]

I'm using season 1 files and source by FireDev and after a few minutes of GS running, this GS is spammed with this error:

response error after connection causes conclusion 6401 127.0.0.1
response error after connection causes conclusion 6401 127.0.0.1
response error after connection causes conclusion 6401 127.0.0.1
response error after connection causes conclusion 6401 127.0.0.1
response error after connection causes conclusion 6401 127.0.0.1
response error after connection causes conclusion 6401 127.0.0.1
response error after connection causes conclusion 6401 127.0.0.1
response error after connection causes conclusion 6401 127.0.0.1
response error after connection causes conclusion 6401 127.0.0.1
.....

It doesn't disconnect me until now but idk what it is and it doesn't seem normal.
How to solve?

[MentaL]

[KarLi]

there are few possible reasons.

1. client is not compatible (version of main.exe etc protocol doesnt match)
2. some checksum settings u must disable maybe in commonserver?
3. the GS is bad :S