I'm not of much help, but seeing that this post has almost 500 views but no comments impelled me to post something.
Looking at the JS error, and then going to line 1117 of data.js, that line references sprite19-default-000.png, which doesn't exist anywhere it seems.
It's particularly suspicious that there are Sprite folders in the animations directory of your unzipped capx numbered through and past Sprite19, but not including Sprite19.
An error occurs when you try and export the project.
Seems like your project is corrupt in some way... Have you tried to rebuild the project by making a new one, making all the objects again, and pasting in the events?