Error 0x803E0207

Value: -2143419897 | 0x803E0207 | 2151547399

What does it mean ?

WPN_E_TOAST_NOTIFICATION_DROPPED  
Toast Notification was dropped without being displayed to the user.
Value: 519 | 0x0207 | 0b0000001000000111

Where does it come from ?

FACILITY_WPN  
Notification Platform
Value: 62 | 0x03E | 0b00111110

Other Errors for FACILITY_WPN