Polaroid sx70

Change the film because battery is part of the film assy.
Or clean those exit rollers.

are you using neutral density filter with 600 film? if so, make sure the filter is not covering the top left open corner. the camera needs this free to eject the film. I had the same problem and solved it by cutting a little bit more and inserting the filter under the plastic. be careful not to cut too much that it will show on the actual photo!