Check the following steps to troubleshoot the issue:

1. Check if the memory card is supported: Refer to your printer’s user manual to ensure that the memory card is the correct type and size for your printer.
2. Format the memory card: Reformat the card according to your printer’s user manual to ensure that your printer can recognize the memory card.
3. Reinsert memory card: Remove and reinsert the memory card into the printer.
4. Reseat the memory card by pressing firmly into the slot and ensuring that it clicks into place.
5. Check to see if the memory card is corrupted: If possible, try using a different card in your printer to further troubleshoot the issue.