Forgot Email give a "500 Internal Server Error"

[emgg-test]

When clicking on the Retrieve Error the page gives a "Internal Server Error"

Steps:

1. At the home page select "Forgot Email"
2. Enter an email address
3. Click on "Retrieve Password"

Actual result:
The browser shows "Internal Server Error" having a 500 server error

Expected result:
The browser should be redirected to the page: https://the-internet.herokuapp.com/email_sent