Facebook returned an unexpected dataset. Try to resolve this issue, update the plugin or inform the author about the problem. [Error occured at line 601] Your application's access permissions could not be granted. and other warning box: Some or all access permissions are missing. Please click the button Grant access rights! and authorize the plugin to post to your Facebook profile or page. [Error occured at line 778] Your page or profile's access permissions could not be verified.
There are a number of us experiencing this issue as shown in this post