Could be that you have your Desktop as your RFactor folder so the export cannot find the rfactor - projects folder. Try putting in the path ending at the rFactor folder.
I tried Google translater to give me an idea of what it could be but it was no help.
If you want to pm me a link to the project I'll have a look at it.
Could be a messed up xPack. First try exporting it with a simpler name.
