This looks cool. But I'm getting a javascript error when trying to sign up. TypeError: Cannot call method 'toLowerCase' of undefined [http://www.hackerrank.com

This looks cool. But I'm getting a javascript error when trying to sign up. TypeError: Cannot call method 'toLowerCase' of undefined [http://www.hackerrank.com/assets/application-18e8ea124a726771ae0f901e4094ee4f.js:16 http://www.hackerrank.com/assets/application-18e8ea124a72677...]