A software error has been detected on the MMU unit.
Make sure that you are using the correct up-to-date firmware for both the printer and the MMU unit: Firmware download.
If that does not solve the error, take note of all the actions that preceded the error happening. Try to reproduce the error, and save the log.
After that, contact our カスタマーサポート, or report the issue directly in the Prusa GitHub page.
If you have a question about something that isn't covered here, check out our additional resources.
And if that doesn't do the trick, you can send an inquiry to [email protected] or through the button below.