Error 0x8021000D

Value: -2145320947 | 0x8021000D | 2149646349

What does it mean ?

WIA_ERROR_DEVICE_LOCKED  
The device is locked. Close any apps that are using this device or wait for it to finish and then try again.
Value: 13 | 0x000D | 0b0000000000001101

Where does it come from ?

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

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