F8 Error

Question

Unfortunately I pushed a capsule inside this little door instead of on the little balcony and then pressed the button. It stopped while the press was down. I could remove the capsule and could see no damage. However, when turning it on again, it simply shows "F8" on the display and doesn't do anything at all. The press is still half down and the balcony thing doesn't come out fully. What can I do?