How Do We Achieve a More Elegant Customer Sign-Up Process?

During our tests a mistake in the expiration date brought up a "false" warning with a red bar- only at the top...

1. the user doesnt know there is a problem unless they scroll to the top

2. At the top is sais "False"

Because we were testing we were able to find out the reason for "false" was the wrong expiration date...

What Solutions do you have for this?