Meaning: Gap frame connection is missing a required input.
Recovery:
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Open the Structure task.
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Click Select .
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Set the Locate Filter to Frame Connections.
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Select the frame connection in error.
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On the ribbon, select Unsupported in the Connection box. This action clears the invalid gap frame connection.
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Select More from Connection box.
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Expand the available Gap connections, and then select the gap connection that you need.
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Finish placing the gap frame connection.