[Plugin: WordSocial] can't get rid of the annoying error message in admin panel

Hi,
I am very happy with the plugin and it does a great job!
But since couple a days I am having an annoying trouble. At the top of the admin panel it displays an error message that I can’t get rid of:

WordSocial Information
2012-01-24 14:26:08 – Error publishing on Twitter: post id 1123 [Reason: Status is a duplicate.]

The plugin works so that is not the problem. I just don’t want that massage following me all around the admin panel. 🙂

I looked on the WS admin page but I can’t seem to find anything to do about it.
I tried following:
1. I repost the page that the error message refers to. No change.
2. I revoked the access to my Twitter. Message is still there.
3. I connected the plugin with my Twitter again, No change.
4. I moved the post that error is referring to to trash. I emptied the trash. The error message is still there, referring to the same (now non existing) post.
5. I made a new post instead. The plugin worked just fine and post it to Twitter. No new error message. But the old one is still there.
6. I logged out and in to admin panel several times, no changes.

What could be the problem???
I have the latest versions of WP and the plugin.

best regards
Misko

http://wordpress.org/extend/plugins/wordsocial/