Comments plus giving problem with twitter

I am getting this error in the small twitter window that opens if you want to post on twitter as well

"Whoa there!
The request token for this page is invalid. It may have already been used, or expired because it is too old. Please go back to the site or application that sent you here and try again; it was probably just a mistake."

I can see that i am logged in my account in twitter in the same window. Can you please help me out little.