Having a problem while creating the cartridge

this happens when i press i

Hi Yousif! I haven't worked through this course yet so I'm not sure what the end result should look like in this case. However, from your screenshot I am guessing that the issue is the way the lower "panel" is insetting? It's overlapping itself? Ensure you have scale applied to your object. It's possible you might have to inset each panel separately...but if it's shown like that in the course there must be a way to do both at once.

Thanks alot it was a case of double vertices