I finally got around to opening this and I never had any errors when I converted it. I did more work on it and it's almost complete. I will be uploading the new version in a few days.
To see the true error you would need to click the console tab. I might not be able to solve it, but it can sometimes give a clue about the problem.
This was made in an older version of the engine. I'll have to look into it and try to update to the newer one and do a little more work. I stopped because it lags for me, but there was an improvement so it might work better now.
If you want this to work you can always reinstall Paper Maker and choose version 2.0.7. But it's pretty short and maybe not worth it yet.
