I started several projects using the online version, and have just installed the software (paid Mac version). I have tried to export my projects from the online version so I can open them with the application on my computer, but I am getting this error message every time.

"Can't create SH3D file"

I saw through the forum that another user had similar trouble because some element of their project was buggy, but if that's the case I have no idea how to find out which element might be causing mine to do the same.