Why is my camera on my htc one mini 2 not working?

[AC Question]

I have had my Htc one mini 2 for less than a year, and on the weekend my camera just stopped working. like whenever i open up the camera it comes up with a message saying that the camera was unable to open. I have even tried opening it in snap chat and instagram and the same message comes up. I have also tried turning it on and off.