Error Message: "Something wrong about submitted email"

Now that I finally got APP+ set up I am doing a TEST for the App+ Calendar and am getting an error message saying "something wrong with submitted email" which pops up when I try to submit info for an appointment and so I cannot submit a TEST appointment.

I tried a couple of different emails and got the same message! What does this mean? Is it that The email is not going through? or that it thinks that it is not a valid email?
HELP please...
thanks :slight_smile:
Susan