This is probably because there's no microSD card inthe card slot or because the microSD card is full.
If the microSD card is full:
Insert a microSD card. Move the images from the microSD card to your computer to clear storage space on the card.
To format the card and delete its content:
1. Press the On/Off button for 2 seconds to power on the scanner.
2. Press the Menu button.
3. Go to the 2/3 option group and select the SD formatting option.
4. Select this option to delete the content o fthe microSD card.