Meaning: The software expected the third input into the axis-end connection to be the end port of the supporting member. This is an internal software failure where not all the inputs were provided to the connection correctly.
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 By Rule from the Connection box on the ribbon.
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Redefine the end location of the member.