on the interior image the wall to the left of the doors.. Make it longer and then select the new piece. If the entire wall all the way to the door gets selected make another tiny little wall coming straight out from it where the roof intersects the wall at it's lowest spot. Open the properties for that wall and make it invisible and remove it from the schedule. Now you will be able to select the section of wall you made to fill the hole. Open the properties for that wall and click on "roof" and check off "roof cuts wall at bottom"
kgschlosser's post in How to close the opening between wall and roof when building a dormer? was marked as the answer