Why is my camera on my htc one m9+ is not starting up

[AC Question]

Why won't my HTC one m9+ camera won't start just telling me unable to start camera when I touch the app I even tried downloading a camera from the app store same problem

 

[B. Diddy]

Welcome to Android Central! Chances are that you have some other app that has Camera permissions and is inappropriately preventing the Camera app from opening. Flashlight apps often do this. Uninstall any app like this, and see if the problem persists. You can also try booting into Safe Mode to confirm that the problem is due to a 3rd party app: https://support.t-mobile.com/docs/DOC-20834