I cannot scan from the bundled application (Presto! BizCard or PageManager). (Macintosh)

Operation system return error

Driver busy

Calibration failed. Please reboot the machine.

When I press "Scan" in my scanning software, an error message appears: "Please install scanner" or "The scan was aborted because the scanner is not powered on or not connected properly".

The cover of the manual document feeder is open.