A LandingCurve ActiveEntity does not have a related geometry.
A landing curve active entity (AE) does not have a related geometry: Missing the resultant generated geometry (GeometryGeneration_RSLT1 relationship) to LandCurve, ProfileLandCrv, or ProfilePartPath for LandCrvIntersect_AE, LandCrvOffset_AE, LandCrvProject_AE, LandCrvTable_AE, LandCrvER_AE
What You Should Do
Open the model.
If the object is on the To Do List, perform the re-computation. Or, switch to the Molded Forms task, select the object, and perform a re-computation.
Re-run the Check Database Integrity custom command and the DBIntegrity report.
If the object is still posted, contact Smart 3D Support.