Meaning: The flush member's supporting member input is not a member system, resulting in improper placement of the flush 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 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.