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Hi there,
I've had this problem before myself a few times, it can be a few things. One is that you had a small 'loop' or a small extension to the sketch, in the sketch geometry, so it essentially tries to follow the sketch around and in doing so tries to machine the other side of the loop or small extension.
Another is that there is a very small hard to notice cavity like so, that can only be seen by zooming in a lot:
Another is that lines are overlapping each other in the sketch, either creating a small gap or making the geometry loop back on itself, which the toolpath then tries to machine the other side, so just delete the lines and create one line instead to close the profile so you can perform the extrusion.
Try looking to see if these apply and let me know if it solves it. If it does, click "Accept Solution".
Thanks,
Graham

Graham Goodier
Product Specialist
Fusion