Meaning: The constructed cross-section that was used to define the member part is incomplete and does not have its width and/or depth properties. The most likely cause of this problem is that an older version of the cross-section definition was selected or a ship structure defined cross-section was selected. Without the width and depth properties the frame connections will not work properly and any member that frames into this ill-defined member will fail.
Recovery:
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Select the member
that is in error.
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In the Section box on the Member Controls, select a different cross-section.
For custom sections not delivered, see the 2D Symbols for detailed instructions on how to properly construct a member cross section.