test site migrating 3.0 ning site
Ning To Jamroom
The default folder name is Ning_Archive so that is why it worked when you renamed your folder to that. If you had change the folder name to your original in the NingImport config section it would have worked (though I tend never to use spaces in any server folder or file names - I'm not sure that Linux handles them that well!!).
Anyways, glad its sorted. Looking forward to seeing your site and how well the Ning3 members pick up on it.
TIP - Install and setup the Kickbox module now so that it can be checking that all your member emails are valid for when you send out the passwords. Mailgun can get upset and block you as a spammer if it gets a lot of bounces from a mass emailing.