Site displays errors to site visitors

Hello My website dashboard displays a critical error : "your site is set to display errors to site visitors".  I first noticed this a week or so ago. Now today, when trying to save my blog I suddenly got a message "Edit blog wants to use your confidential information stored in "Safari Forms Autofill Encryption Key".  In desperation to save my blog I entered my Mac password.  I have no idea whether my Mac  is now very insecure  or whether it is related to the dashboard error message, but I report it here in case it is.