Help Mainloop Error (Cpu Or Idk)

Hello, i wanted ur opinion about this error upon Login in server.

 

History: Setting 2_1 <- Setting 2 <- UIPacket <- UNetworkHandler::Tick <- Function Name=UIPacket <- UGameEngine::Tick <- UpdateWorld <- MainLoop

It happened on dedicated, when i moved files to other PC it was ok, moved back in dedicated same error, increased dedicated's core from 1 to 2 and error disappeared but

happened again to someone for 1 time only. 

Idk what is exactly but for sure is not client error. Maybe something wrong with CPU or network? anyone hadthis before or any advice?

ty