HP Officejet Pro 8500 - Error messages appear

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Error messages appear

Unable to activate TWAIN source or An error occurred while acquiring the

If you are acquiring an image from another device, such as a digital camera or
another scanner, make sure that the other device is TWAIN-compliant. Devices
that are not TWAIN-compliant do not work with the device software.

If you are using a USB connection, make sure that you have connected the
USB Device Cable to the correct port on the back of your computer.

Verify that the correct TWAIN source is selected. In the software, check the
TWAIN source by selecting Select Scanner on the File menu.

Reload document and then restart job
Press the OK button, and then reload the remaining documents in the ADF. For
more information see

Load the originals