Error while Processing when creating a Mail Alais

Error while Processing when creating a Mail Alais

I'm a new user, and was wanting a second email for myself.  But when trying to create a mail alias, I keep getting the "Error While Processing" message.

Some background:  I initially though I needed a second account for a separate email, and created on with the email I intended to use.  When I realized what I really needed was just an alias, I deleted that second user.  Now, when I try to add the same address as an alias, I first get a message saying Permanent & Irrevocable data loss ahead.  Since it was for the "second" used I really don't need, I type in my password to delete it.  That's when I get the "Error While Processing" message.