As specified in the title my problem is only that. Any app I open in my phone crashes with the message "Unfortunately the app has stopped working".
Only the Google apps, Edge browser, Camera and Whatsapp are not crashing rest all apps are crashing on opening.
This started happening without any change. I left my phone in a good normal condition and after an hour when I came back it showed "unfortunately truecaller has stopped working". I also tried opening games but they also kept crashing. No use of restarting or switching off and on. I've done that literally a hundreds of times.
My phone is not rooted. Just a normal phone running Android 6. Please help me fast.