Meaning: The brace must be related (using a point-on relationship) to a split connection or an end joint of a member. This is an internal software failure where the relationships for the vertical corner brace were not established correctly.
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.