This “unfortunately camera has stopped” error is just a system bug that is not a big issue if you have stock Android installed. Usually a simple restart or clearing cache will fix this error.
Method 1: Restart phone
Well, this is a very straightforward step that could easily fix the camera has stopped error on your smartphone.
=== Method 2: Clear cache and data of your Camera application ===
Most of the time, the application cache may cause this error. To fix it, simply follow these steps:
* Go to Settings >> Apps (or application manager) >> Swipe to go to “All”
* Now scroll down the list of apps, and tap on “Camera”
* Tap “Clear Cache” & “Clear Data”
* Now restart your smartphone
Open the camera app and check for the error.