Not really a good idea to dry fire the camera. Guess ya don't have a manual? The Err signal blinks when there is no film in the camera.
Get to the local camera shop and pick up some ammo. Even your local grocery store should have film.


PS:One of the best lessons I learned was to read the manual from cover to cover, 4 times, before even loading a roll of film.
"Haste lays waste"