Peer review 1 not working - help!

Please view the attached video… I followed instructions/code exactly from the lecture, but the program keeps crashing. The lecture program worked fine for me. How do I fix this?

Hello,

Happen the same to me, your video can be see it, but, when y play de app, appears “Build correct”, and the “phone images” open and something happen and the app can works.

Someone know why is happen?