Hi guys,

Im working at a model and when i draw a rectangle and want to extrude cut it is appears this message rebuild errors, and realy got no idea what might be i had a look around and everything seemed ok but can't manage to cut it. please let me know if i need to upload the actual file or if you can guide me from the attached pic. I draw the rectangle directly on the objects top. i also tried to draw it on a paralel top still same.

Many thanks.