Unfortunately app has stopped problem solution (With Picture)

Just follow the below step by step instruction hopefully your problem will solve. 

Step-1: Going to your phone 'Settings' option and click 'Storage' option :) 

Step-2: Then click the 'Cached data' option for clear your phone all cache data :)

Step-3: After clicking the 'Cached data' you will show like same as below interface, press ok button :)

Step-4: This is final step go to your phone 'Backup & reset' option then click 'Factory data reset' option hopefully your problem will be solved. Have fun...