Cannot extrude although lines are correct ?

Hi, I have created a square box, and on top if it, I placed an image that I am outlining.
The problem is that I have created all lines, they are correct, and the outline is absolutely complete,
but when I want to extract the innerside, it does not recognize the different surfaces.
I have been going over this model for about 2 hours, redid a lot of lines, nothing seems to help. I also checked the underside of the face I drew the lines on to check if they are indeed continuous and they are.

Anyone know of a solution?

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Hi Hardi, it's kind of difficult to help out from a description, if you can upload your file I think we could work out your problem much better.

 
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