Meaning: Failed to process the plate knuckles on an imported plate. The plate surface is not marked for knuckles. This happens for imported surfaces created from a SAT file with no attributes or bad attributes for the knuckle edges.
Recovery:
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Correct the imported plate's SAT file with the appropriate attributes for the knuckle edges.
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Perform an update/recompute.
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If the problem persists, report steps taken and include the SAT file to your support group.