Feral Heart

Well I just exported a new map that I made and so I turned off Feral Heart and went back on straight away but the problem was. When I did that, it was just a white screen than it shut down instantly. I thought it was just a little error, it came up with the small box after you crash. So I pressed enter and that didn't work so I thought i'll try pressing the 'ok' button instead, same result. So I re-downloaded Feral Heart and copied my files into that, it worked last time when I did that and I thought I could do it again but it didn't work. Guys, please help me on this, i've worked for so long on this map and I don't and I can't just let it go like that.