Error Messages "Import comment: Facebook error"

When i login to my Blog there are many red Informations on Top since the Upgrade to WordPress 3.5. Example:

Add Link to Facebook - Fiat Panda als „Bigfoot”: Import comment: Facebook error: TSocket: Could not read 4 bytes from 10.170.54.81:12001 to local port 65120 (Array ( [wrapper_type] => Socket [stream_type] => [mode] => [unread_bytes] => 0 [seekable] => [uri] => [timed_out] => [blocked] => [eof] => 1 ) ) @ 2012-12-14T17:38:47+00:00

What is the problem and how can i solve this problem?

Kind regards
Hajö 🙂

http://ww.wp.xz.cn/extend/plugins/add-link-to-facebook/