My DTC300 printer has the same problem.
The ribbon supply roller is driven by a small motor connected via an O-ring belt. The printer rolls the ribbon back and forth to locate the start of each color panel on the ribbon during printing and ribbon detection. Without the O-ring, the ribbon only moves toward the take-up spool, eventually going slack so that the color detector only sees one color - hence the "wrong ribbon" message. In my printer, the slack ribbon also gets chewed up in the print head.
You can order a whole belt kit (~ $20 + shipping) or you can locate a generic O-ring belt (1.8mm x 26mm).
Cheers
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