Development Environment:
1. Android Studio (Version 1.41.)
2. Operating System: OS X El Capitan (Version 10.11)
I did not change any part of the code. I just initiated proper shutdown of the system after closing all the applications.
Next time when i opened the same project, i got the above error.
How i resolved it:
1. Go to Build
2. Select Clean Project.
3. Select Rebuild Project.
Error Gone :)
