Thank you for your feedback, i am pretty shure about what is causing your problem, and i am already working on it.

The problems seems to be that you have not marked any photo from Flickr as favorite (i must admit that i did not have this case in mind when i implemented this part of the plugin).

As a workaround until i have a good solution for this issue, you can visit the Flickr page and mark an arbitary photo (may not be a photo from yourself) as a favorite, please report here if this fixes the problem you are seeing.