I was having the same problem with camera and showing the same error you guys have mentioned. Since it was related to camera, i knew there was something wrong with apps using camera and i remembered the time,problem started. This problem started when i started using HEALTH MONITOR APP which gives u detail on blood pressure,etc etc using the flash light and camera of the phone. I unistalled the app but still i was having the issue. Then i went to internal memory folder of the phone, deleted a file named blood monitor, etc it can be anything which is something related to the app u installed previously, in my case it was blood monitor.I just deleted it, and voila! Problem got solved immediately. unistalling or doing whatever you want wont solve it unless u factory reset but if u target a correct logical problem and delete the root issue, u can save ur phone from reset. I am not programmer or anything, just a simple user, this logic workd for me, i just took my 10minutes to write this post may be sometime it may solve the stress of someone who is facing similar issues. Guys just see to it, and try it.BYe guys have a great day.:-[:-[:-[:-[:-[