We'd like to gather more details about the issue so we can best help you. When you get the chance, connect with us through the GoPro Support Hub at https://community.gopro.com/. Please indicate that you were referred from the Play Store.
Sorry to hear you're having camera issues. Open the following link on a computer web browser and run through the manual update on your camera - https://gopro.com/update/. Once it's fully updated, you should be able to connect to the GoPro app and use it as normal.