Either a New Spline Point (X/x) Command or End Segment (T) Command was issued to an axis whose current curve is an Auto-Repeat curve. While this is technically a valid thing to do, this is not allowed because in many cases this will have been accidental. If you actually intended to overwrite the Auto-Repeat curve, issue a Clear Spline Segments (C) Command to clear the Auto-Repeat curve before downloading the new curve.
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