I have not been able to use DropBox for months. I consistently get this error message whenever I try to send a file. I've used this service, without issue, for years—and now it's completely unusable.
For clarity, this happens on my first attempt to send a file. The only way this error makes sense is if my limit of 'invites' is zero—which wouldn't make this service very useful. Right now, this service isn't useful. Your help in resolving this issue would be greatly appreciated. Thanks!