Meaning: One of the corner brace's supporting members was not provided as an input to the vertical corner brace. This is an internal software failure where not all the inputs were provided to the vertical corner brace.
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 By Rule from the Connection box on the ribbon.
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Redefine the end location of the brace by selecting the frame connection of the supporting beam.