Meaning: Failed to retrieve the base curve used to define the geometry of this object. For example, while creating the geometry for a seam or a profile by offset, the referenced base curve was not available. The reference curve may have been deleted.
Recovery:
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Verify that the base curve has not been deleted.
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Update the base curve if it is on the To Do List.
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Reference another curve from which this object is to be offset.
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Change the geometry type to profile or seam by intersection or make other updates that would resolve the situation.
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If the problem persists, report steps taken to your support group.