Meaning: Members must share a common internal axis joint or the supported member is point-on with supporting member's axis joint. This error should never happen and 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 frame connection in error.
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Select More from the Connection box.
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Select Axis Colinear > AxisColinear1, and click OK.
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Reselecting the supporting member.