Meaning: The centerline member and the supporting member are the same object, resulting in improper placement of the centerline connection. This error is an internal software failure where the calling software is attempting to make a member centerline with itself.
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.