Strange error when creating new Blog post

I received the following error when I tried to create a new blog post.

Fatal error: Cannot declare class OAuthSignatureMethod_HMAC_SHA1, because the name is already in use in /home2/mrwizard/http://michaelscookbook.com/administrator/components/com_easyblog/includes/oauth/adapters/oauth.php on line 136

I think I may have FUBARed something but haven't a clue as to what it is. Any assistance with this would be most appreciated.

Thanks in advance.