Meaning: The cross-section definition referenced by the member part was removed. This might have been the result of a catalog synchronization where the original symbol was removed. It might also have been caused by a corruption of the definition and the removal of the definition by the repair script.
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 new cross section for the part even if the name is the same as the originally assigned cross section. This action regenerates the member part based on the selected cross section.