You might have to manually take out the film cartridge and feel around the top of the camera on the inside to make sure nothing is blocking it. If you want to save that cartridge from light exposure, I suggest going into a dark room or a closet. The same thing happened to mine and I just pushed on the inside of the camera and now it works fine.

I had the same problem. I ended up going into a closet to take out the film so it wouldn’t be exposed to light and pressed on the inside top of the camera to make sure nothing was blocking the area where the film comes out. I put the same film cartridge in and it started working for me. So maybe something’s blocking the inside?