I have Evolution 11 and get "Error" while Prosjekt Loading. I followed the Instruction given 03/16/2012:

1. Deleted the "preview" and "upload" folder
2. Deleted prosject.iwprj and metadata.xml.

But I did not find the file backup.iwprj, only the backup-folder with several iwprj-files.

So now I'm stuck!

Regards