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when i switch it in front camera it says that, "Unfortunately gallery has stopped"
how can I fix it?
Hi @kit24,
Welcome to the community.
Let's try to reset the camera and gallery apps. To do this please go to Settings > Apps > Camera/Gallery > Clear Data > Force Stop. Do this for each, then restart your phone and try again.
in my apps there no camera,, theres only gallery,
and I try it but it doesnt change 
To find Camera in the apps settings, you may need to swipe over to "All" if you are on Lollipop. If you are on Marshmallow press the 3 dots and choose "Show system".
theres no camera app,, why? do i need to install an app for camera?
What version of Android are you on? You can find this under Settings > About Phone.
5.0.2
Under Settings > Apps, you will have several pages. Swipe to the last page "All". Camera will be listed in here.
Since this afternoon, my front facing camera doesn't work and I don't know why... I did nothing particular.
The icon isn't there anymore.
Thanks for your help!