applications – Getting unwanted message “There are trespassing signs. Check it in Observer Settings screen.”

There are trespassing signs. Check it in Observer Settings screen.

I am getting the above message whenever I open a new app on my Android 4.1.2 Samsung Galaxy Grand DUOS. This has started suddenly when my child was just playing a simple ABC kind of rhymes.

Following things have been tried by me, in the given order, but without success:

  1. Check out which was the last 3-apps installed and uninstalled them
  2. Cleared App-cache
  3. Did a restart

Any pointers or solution is welcome.