The mint's connection to its LND node is not working. LND nodes get restarted fairly regularly, mostly because of updates.
Try your mint again in a few of hours.
Is this why it would be good to add mints. I do only have one mint.
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Yes, absolutely. Keep at least 3. Balance sats out amongst them. Use mints that have contact details so when there's problems, you can contact them. 👍