Why isn't the fillet command working?

On this shape, I tried to use the fillet edges command, but it
didn’t work. I don’t know why, could someone please assist me?

Untitled.3dm.zip (54.0 KB)

the curvature at the top edges of your extrusion profile has a radius close to 0.056cm This means any radius larger than this is going to create issues.

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thank you so much