E5 and 03 are alternating on the 7 segment LED of the main module of the SMARTDAC+ GM10. How do I keep these messages from appearing?

On the GM10, the main module's 7 segment LED displays the contents of errors.
When E5 and 03 alternate, this means error code E503, indicating that that the SD card was not recognized. For corrective action, see section 5.2, >Troubleshooting> in the user's manual (IM 04L55B01-01EN).