Can't follow path

Hi folks, I can’t seem to make Shapr3D sweep the path highlighted in the attached for the also highlighted sketch. When I get to the curve at the top right corner it gives me an “Failed to handle nonG1 path” message. I am a skateboard designer and I was hoping I could sweep the concave (the highlighted sketch) along the profile (highlighted line). The curve I can’t seem to get Shapr3D to follow is the point where I want the concave to end gradually as the tail section starts to curve in another direction. Is there a better way to do this?