Sansa Express keeps showing 'Already Exist'

I pressed all the buttons and none of them worked. It keeps playing the same song even though it shows 1/15, i.e, there are 15 songs in the player. Everytime I press either one of the button, the msg ‘Already Exist’ comes on. I don’t understand this at all.

Have you tried to reset the player?  Hold Select and Vol+.

I think you can fix it by formatting it.  There’s a Format command under Settings.