Why do I get error message "Unable to send e-mail. Please contact the site administrator if the problem persists."?

Why do I get error message "Unable to send e-mail. Please contact the site administrator if the problem persists."?

Some time bank members do not have actual email addresses, so the email address field in the profile contains a place-holder (fake) email address.  The message is issued when Community Weaver attempts to send an email to such an address.  It's just letting you know that the member is not going to get an email notification.