My back passenger window makes a loud cracking noise when I first lower or raise the electric window.

I took the panel off to see why it was doing this noise but could not see anything.

It sounds like the window motor or some other metal knocks agains the metal part of the door when the window changes direction.

Any idea what could be causing this?

I have 55K so I would like to see if I can adjusted or fix this myself.

Thanks for any advice!!