Please accept our apologies for the trouble.
First please try turning your device off and on and try using Slide again.
If the problem persists, please go to 'Profile' and press the 'Settings' icon. Then click on Help center and submit a request with the following information.
1. The trouble you are experiencing with Slide in detail
2. Check if your phone's basic camera application is working
3. Send us a screenshot/video of the error