Film advance lever.

Hit or press the film release button or replace with a known good battery.

Use or buy a brand new battery from store that sell lot of them.

Do not get from store that only has a few, meaning they have been sitting there for years.

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Have you rewound the film? If you rewind the file completely and pull out the rewind know, it will pop the back open . . . and can remove the film cassette. While the back is still open, complete the cycle on the winding crank. The winding crank should return to "Normal" arter you complete the winding cycle. When you close the back, everything should go back to normal.

If the lever won't advance even when there is no film in the camera, then I would say there is a problem. (p.s. You haven't told us the make and model)

A Canon AE-1 is not an EOS camera the Canon "A" series is manual focus while EOS is auto focus. First thought In answer to the advance lever stuck or jammed I'm going to assume the camera is in serviceable condition and has not been subjected to water damage or harsh use. If we are dealing with just the advance lever then I'd say that you have over advanced the film at the last frame. I've done this myself after loading a 24 exposure and thinking I had a 36 exposure film. At the bottom of the camera there is a little pin which releases the advance lever and allows the user to rewind the film. Under normal conditions when it's time to rewind the film into the canister this pin offers little resistance to pushing in to release, however depending on how much force the advance lever has been subjected to increases the tension on this pin. Push the pin in and rewind the film.
Second thought is if you have film in the camera and it has not been used fully then it's possible that the film has already been advanced to a new frame and the shutter needs to be activated before the lever will become free and advance to the next frame.
Other problems with the Canon "A" series cameras is they have a tendency to dry out the lubrication and begin to squeak when the shutter is fired. This condition can eventually result is a shutter seizure and give the same advance lever condition.
Those are the three things that come to mind over this lever problem lets hope it's just run out of film.

The film is either at the end or stuck. The shutter will not release unless the film advance lever has gone all the way and back.
Make a note of the frame counter. Rewind the film and remove it from the camera (When you feel the film to come loose from the receiving spool, stop rewinding to prevent the end of the film to disappear inside the can. This way you can reload it if it was stuck in the middle.) If the film was completely exposed, take it to be developed.
With the empty camera, try to advance the lever and release the shutter. If this works, the problem was the film and not the camera. Everything is fine. If the problem persists, take it to be repaired.
If the film was stuck in the middle, load it again into the camera. With the lense cap on (preferably in a dark room or similar) 'shoot' as many 'empty' frames as you had on the counter plus two more. Finish the film and develop the pictures.
If the film stucks again at the same place, rewind it and develop normally. It was a bad film.
Hope this helped you to solve the problem.

please read the manual... u ll get the solution.

No, it is not the battery. My guess is that the film leader did not stay in the take-up spool and is now bunched up around it. Try rewinding the film carefully as you normally would but remember that you are only rewinding a small portion of the length. You can even just open the film door and start over. You will only loose 3 or 4 frames on the roll.

Hi, check the camera set in auto /manually in auto function, check battery might drain the current , dis engage camera to lense to release the mirror by pressing button beside lense , turn lense in left or right .