Meaning: The vertical corner brace expects three input objects: two supporting members and a supported brace. This error 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.