Can't find 'error_notification' method

[payton99]

In chapter 19, under the section 'Create a New Contact Page' there is a paragraph that says: "We've added the error_notification method which provides all the error handling." However, when I look in the box that contains the code, I don't see an error_notification method. So am I just missing something?

When I test my application and fill out the contact information with an invalid email address, it still submits it without an error message. Someone please help!