The console is very often used for game manipulation (especially by admins). This message ("Error: server failed to transmit file 'customization") shows up often enough to become stressful, because in the most cases it appears like 10 times in a row.
This is not a fad for me, I'm good with programming, but I can't find a way to block this message, even if I tried. I just ask for an idea, a point to start from. I didn't study in a profound way the CS engine.