Share 'Adding photos from Flickr - receiving an error message.'
Oops! Flickr can't find a valid callback URL.
An external application has requested your login credentials and permission to perform certain actions on your behalf, but has failed to include all the required data.
You don't really need to know what this means, except that you can't use the application until this problem is fixed. (It's a third-party problem, not a Flickr problem.)
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