Error 0x80210006

Value: -2145320954 | 0x80210006 | 2149646342

What does it mean ?

WIA_ERROR_BUSY  
The device is busy. Close any apps that are using this device or wait for it to finish and then try again.
Value: 6 | 0x0006 | 0b0000000000000110

Where does it come from ?

FACILITY_WIA  
Configuration Services
Value: 33 | 0x021 | 0b00100001

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