What is the reason is still unknown, but apparently, the problem is in the update of the application 18.104.22.168, which was released the other day. Google is already aware of the error and is solving it.
At the moment, there are several solutions. First, try restarting the program. To do this, find Google App in the list of all apps and click”Stop”. If this does not help, reinstall the app via the Play Store.