Meaning: The provided surface input into the surface frame connection is not a valid surface. This is an internal software failure where a planar object was provided but does not properly behave as a surface.
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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Select More from the Connection box on the ribbon.
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Click Surface in the tree view and then select Surface-Default in the list view.
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Redefine the end location of the member.