Meaning: The centerline member's supporting member was not provided, resulting in the improper placement of the centerline connection. This error is an internal software failure where the software did not properly call the frame connection with its required inputs.
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 More from the Connection box on the ribbon.
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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.