Meaning: Both ends of the supported member share the same end joint. This error is an internal software failure.
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 Unsupported from the Connection box. This action clears the error.
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Select More from the Connection box.
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Select Axis > Axis-End, and then click OK.
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Select the supporting member.