The camera permission is not turned on, the application version is too low, and the mobile phone system version is too low.

1. The camera permission is not turned on: You can go to the phone settings, open the application, and then open Tik Tok, and find the permission management to confirm that the camera permission is granted correctly.

2. The application version is too low: You can update the Tik Tok application to the latest version in the mobile app store.

3. The version of the mobile phone system is too low: you can go to the mobile phone settings and update the mobile phone system to the latest version.