The issue was resolved by checking the database file. To prevent the same issue from happening again, please follow these recommendations:
Verify the Excel file source. Make sure CardExchange is linked to the correct Excel file.
Do not move or rename the Excel file. Once the file has been linked to CardExchange, keep it in its original directory.
Check the file location. Ensure the Excel file remains accessible at the linked location so CardExchange can retrieve the data correctly.
Important: Moving the Excel file to another directory after linking it to CardExchange may cause connection issues because the software may no longer be able to locate the file.