Meaning: The axis-end frame connection expects three input objects: a supported member, an axis-end supporting member, and the end port of the supporting member. This error is an internal software failure where not all the inputs were provided to the axis-end 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 By Rule from the Connection box on the ribbon.
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Redefine the end location of the member.