Score randomly stops exporting.

I'm trying to export a score, but every time I try, it will just stop exporting as soon as it reaches 50%. I have retried many times, restarted the program and my computer, and tried to research to correct the issue, but have been completely unsuccessful. I have also tried creating a completely new score, editing the instruments and mixer, the copied and pasted all the notes into the new one; I was still unsuccessful. I have put many hours into this score, and I would hate to see it wasted. Please help!