Is xcb-util-errors what you mean?
sudo pacman -S xcb-util-errors
Searching works better with the right package name. 
Please take some time to familiarise yourself with Forum requirements; in particular, the many ways to use the forum to your benefit:
The Update Announcements should be checked frequently for important update related information.
These announcements contain a Known Issues and Solutions section and should generally be checked before posting a request for support.
Please provide system information according to forum requirements in the links listed (above). The output of the following command may be useful for those wishing to help:
inxi --admin --verbosity=8 --filter --no-host --width
Be prepared to provide more information and outputs from other commands when asked.
Regards.