Fillet Odd Edge

I am trying to fillet the edge in this shape to 0.05" to mate to the attached above.

The fillet radius can go to zero after that.

No matter what I try I get

“Failure in building corners.”

Problem72.3dm (538.7 KB)

What sequence might I use to get a 0.05" radius at the top?

if equal radii collide they have to generated simultaneously
Problem72 mod.3dm (575.6 KB)

I should have included a pictures. I was trying to fillet the edges that form a triangle. Even if I set the end radius to zero it does not work.