Problem With Filleting Profile

Hello Forum, I have a problem filleting one of my profile curves. I have 2 different profiles, one has been ok, the other is causing me problems, I’m sure its my lack of skills :upside_down_face:. When I’m filleting the shape it keeps failing (or I keep failing :blush:) I have attached a sample file, the green is ok and what I’m trying to achieve with the red layer, the same fillet and rounded end, any advice appreciated, tia
Problem.3dm (490.5 KB)

Hello- the curves are not quite tangent, here:


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yep, correct, too many curves making my eyes funny today :crazy_face: , thanks @pascal :beers: