Is it a section of an assembly or part? If it is of a part, extrude a huge cyclinder that covers the entire part then update your drawing. Will the part section? If so start moving this cylinder extrude back until the part will not section then fix the area that will not section. I had this same issue a couple days ago. Examine geometry did not highlight the issue I found with the part.
If it is an assembly suprress parts until the section works.
I wish this error was a little bit more descriptive. But it is not.