Can't render video. Getting "Error compiling movie".
I'm trying to render a video I've been working on for two days, and whenever I press "Sequence"->"Render In and Out" I get an error saying:

I obviuosly can't keep going and I need to export and give the customer this video as soon as I can.
I have more than enough storage, and a high-end PC that never gave me trouble editing.
