Meaning: An attempt is being made to provide the same member as the first and second supporting member when these two must be unique members, resulting in the improper placement of the corner brace. This error is an internal software failure where the calling software did not properly call the Frame Connection with its required inputs.
Recovery:
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Select the frame connection
in error.
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Select By Rule from the Connection box on the Properties View.
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Redefine the end location of the brace by selecting the frame connection of the supporting beam.