1:Open the .def file on your stage folder
2:then find this in your .def file on your stage folder:
[BGdef]
spr = stages/parallax.sff
debugbg = 0
3:then erase the stages/ in your [BGdef] so it will look like this:
[BGdef]
spr = parallax.sff
debugbg = 0
4:then save it and play.