How to completely disable the Xsession Errors? [closed]

There is lots of question all around different forums but nobody has the right solution.

I tried the following things on Debian based system:

1. in dir /etc/X11/ commented "ERRFILE=$HOME/.xsession-errors" the Xsesssion file. Unfortunately did not solved my issues.
2. Also replaced exec >>"$ERRFILE" 2>&1 to exec >> /dev/null 2>&1