Meaning: A member to support the flush member was not provided as an input into defining the connection. This is an internal software failure where all the inputs were provided to the flush connection.
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 Flush in the tree view.
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Select the flush connection that you want (top, bottom, left, or right).
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Redefine the end location of the member.