Error 0x80240016

Value: -2145124330 | 0x80240016 | 2149842966

What does it mean ?

WU_E_INSTALL_NOT_ALLOWED  
Operation tried to install while another installation was in progress or the system was pending a mandatory restart.
Value: 22 | 0x0016 | 0b0000000000010110

Where does it come from ?

FACILITY_WINDOWSUPDATE  
Windows update
Value: 36 | 0x024 | 0b00100100

StackOverflow

Other Errors for FACILITY_WINDOWSUPDATE