Remove all apps from home screen, particularly any apps downloaded around the time the error message began to show up, this will in turn root out the application that needs to be either completley removed from the home screen or uninstalled and reinstalled. The issue arises when a glitch happens on your home screen apps. Widgets can also effect this, it is known to happen frequently with the WhatsApp and Facebook widgets, by removing these widgets if they are shown on the home screen, should fix the issue.