Lane Butler

I'm generally new to this. I only just got off of garage band and there is obviously a lot more that I have to learn. Anyway, when I try to export my song off of Cakewalk the mp3 or wav files don't play. I've looked ups many reasons this could be and the fixes, but they don't seem to help. I should add that I sent it to my phone and It worked fine from there. Does anyone know why this may be? wow, i may be legit stupid. a quick restart of my computer fixed it..