Smart Pop Up showing an error page when a user submits their information

Smart Pop Up showing an error page when a user submits their information

I have created a smart pop up when a customer lands on my website.  The pop up form displays properly, but when customers enter their name and email address (the same as the template I chose), they are shown an error message (attached).  Even though I chose the success message to be shown in-line, the error message shows in a new browser tab.