Note: This is Techland's Dying Light Support. The below procedure does not work with respect to games other than DYING LIGHT ! To receive help regarding your specific game, contact your game's support directly, please.

This issue for Dying Light is most likely related to Steam's beta updates. Try canceling your Steam beta participation:

If you go to Steam's Settings, then Account, there is a Beta participation section, where you can choose to take part in Steam Beta updates. We  advise you to opt out of the Beta for the time being and the error should disappear.