Fredo's Round Corner won't work in this case??

[sketchuh]

Hi you all,
i created this model and wanted to bevel it, but i couldn't do it. is there other plugin that i can use to bevel it? thanks.

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[gilles]

First look if you got internal faces.
Round corner don't work if an edge has more than two faces connected with.

[TIG]

Also you seem to have some "reversed faces" - fix those too...