Meaning: The centerline frame connection expects two input objects: a supported member and a centerline supporting member. This error is an internal software failure where not all the inputs were provided to the centerline connection.
Recovery:
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Select the frame connection in error.
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Select More from the Connection box in the Properties View.
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Click Centerline in the tree view.
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Select the centerline frame connection to use.
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Redefine the end location of the member.