Photoshop edge improve brush doesnt work

I have a problem with the edge improve brush. While I am in the edge improve brush menu, I select the edge improve brush and drive around the edges. Instead of "cleaning" my edges it deletes my picture( as you can see on the picture). I dont know what I'm doing wrong because I've watched videos and I did the exact same thing, but it didnt work for me. Hope you guys can figure out what is wrong with my photoshop. Thank you in advance!
