how to fix the "unable to open camera" error on j7 prime?

[Android Central Question]

when i used to open camera app it shows error like unable to open camera. and "you cannot use more than one application that uses camera at the same time. camera will close". please suggest me how to fix it

 

[Rukbat]

Close the other app that's using the camera. You can't have 2 apps using the camera at the same time.