Error 0x80270231

Value: -2144927183 | 0x80270231 | 2150040113

What does it mean ?

IMM_ACC_DOCKING_E_DOCKOCCUPIED  
Immersive Accessibility Docking Service :
Value: 561 | 0x0231 | 0b0000001000110001

Where does it come from ?

FACILITY_SHELL  
User Shell
Value: 39 | 0x027 | 0b00100111

Other Errors for FACILITY_SHELL