Error 0x887A000C

Value: -2005270516 | 0x887A000C | 2289696780

What does it mean ?

DXGI_ERROR_GRAPHICS_VIDPN_SOURCE_IN_USE  
Fullscreen mode could not be achieved because the specified output was already in use.
Value: 12 | 0x000C | 0b0000000000001100

Where does it come from ?

FACILITY_DXGI  
DirectX Graphics Infrastructure
Value: 2170 | 0x87A | 0b100001111010

StackOverflow

Other Errors for FACILITY_DXGI