Phone [Q] [HELP] Lg P990 camera problems

Hi i'm new here,sorry if i missplaced thread.

My sister downloaded Retrica on my phone and she told me that app doesnt work. When i open app it starts with front facing camera and when i change it to back camera app freeze and quit.After quiting im unable to start retrica and if i try to open normal app for camera it reboot it self.
Any suggestions or help?

I'm using 4.2.2 android
Avatar ROM: 3.0-arion-1321-20130628-p990