What to Do When You Receive an “Undefined Function is_network_admin()” Fatal Error in WordPress

/ explains how to handle a fatal error in WordPress that claims there is an “Undefined Function is_network_admin().”

What to Do When Your Receive a “Briefly Unavailable for Scheduled Maintenance” Message in WordPress

/ gives a step-by-step guide on how to solve the problem of “briefly unavailable for scheduled maintenance” error message after an automatic WordPress update.