"No triangle side found" error while triangulating

Hello - I have an issue when triangulating my surface after generating inferred breaklines. I have a contour file and am trying to create a surface from it in Inroads SS2. My workflow has been Import Surface From Graphics -> Triangulate -> Generate Inferred Breaklines -> Triangulate. The surface triangulates fine after initial import but when trying to triangulate after generating the inferred breaklines, I get a "no triangle side found" error. I have also tried using "extended data checks" while triangulating.

Thanks for your help!