[Plugin: Twitter Mentions as Comments] Plugin not working

Hi,

The plugin worked fine for a week and then stopped working. It is no longer grabbing the tweets where the post is mentioned. When I click on manually check for tweets, this error appears:

Twitter Mentions as Comments Options
Duplicate comment detected; it looks as though you’ve already said that!

How do I solve this error? Is anyone facing the same problem?

http://wordpress.org/extend/plugins/twitter-mentions-as-comments/