If you use Windows > Model Info > Fix Problems you'll get the results from the previous posts.
When things splat there's normally a good reason for it.
Your mesh is not a mesh that can Subdivide. Turn on hidden geometry. Look at the number of edges around the perimeter. If you select all the geometry look in the entity info box. There's 1221 entities which the majority are at the boundary.
When you subdivide you're dividing each triangle that are very close together. It won't work. You need a simpler shape that needs less think time. Large areas of your mesh triangles meet at one point which makes the subdivision very difficult.
You should watch Dale's Panton Chair tutorial on YouTube. It's shows how to start with proxy model in 2D and progress to 3D. Very educational use of SDS.
Holla back if you get stuck.