The input complex string is poorly formed. Could not retrieve its curve count - Intergraph Smart 3D - Troubleshooting

Intergraph Smart 3D Troubleshooting Reference

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Intergraph Smart 3D
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Troubleshooting
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Troubleshooting
Smart 3D Version
12.1 (2019)

Meaning: Failed to create the ruled surface geometry, it will not display. The input complex string is poorly formed. Could not retrieve its curve count.

Recovery: Verify that all the inputs are properly identified and are not on the To Do List. They must be of the type curve, point or a port (edge or in the future vertex). If proper input has been provided and the problem still exists, report steps taken to your support group.