Loft tool "faulty contact" error

New to Shapr; I’m importing a DWG converted from an Illustrator SVG. I’ve done what I wanted to do with five out of the six letters that I’m working on, but the shapes of the “B” aren’t working.

The error I get is "There’s faulty contact between 2 of the lofted body’s faces, edges, or vertices.”

Is there any way I can find out where that problem is, so that I can (hopefully) adjust the artwork accordingly? Thanks in advance!

Images available, not sure if I can add them or if they’re necessary.