I've written this assuming that you will have viewed the part file somehow.  I'm not sure if I could explain the problem very well if I I didn't attach the file.  I've traced up this sketch from a picture I imported.  I then deleted the image since my sketch was done.  Now that I have done that, I need to extrude the part by 0.375in.  However, whenever I try to do so, I keep getting an error that says my sketch contains a self-intersecting contour.  The repair sketch feature and the check sketch under >Tools >Sketch Tools >Check Sketch For Feature both say that there is nothing wrong and that it can't find where this error is occurring.  I've checked all my vertices but to no avail.  How am I supposed to fix this?

-Thanks