Fillet Surface problem

I hope to fillet the surfaces on the toy car model for a more smooth form.

However, gaps are created after I fillet them.
Shown as below.

Is there any way to fix this problem, or a better way to fillet those sharp edges? thank you.
The Rhino file is as below
fillet problem.3dm (1.6 MB)

First step towards fixing this problem would be to purchase an official license.

Testing 3dm Archive: C:\Users\666\Downloads\fillet problem.3dm
Start Section: 462 bytes (offset 0 to 462)
Offset: 0
3dm archive version: 70
Interface Name: Rhinoceros 7.4 - Corporate, build 2021-03-08 - (compiled Mar 8 2021)


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