Meaning: The boundary objects for the tripping stiffener are not valid, have been modified, or are missing.
Recovery:
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Select the tripping stiffener in the To Do List, and check the boundary inputs.
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Provide any missing inputs, or reselect the inputs. Verify that the connection type is valid for the given case.
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Verify that the connect point data is valid in the tripping stiffener properties.
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If these steps do not resolve the issue, try removing and replacing the tripping stiffener.