Sorry, I don’t know social-it, but looking at the error it appears that you are missing a header. The header that is missing is functions.bb-meta.php which is included in bb-settings.php. Most likely, you are missing a require to bb-settings.php.
Are you installing social it on wordpress?
Then use SexyBookmarks plugin.
Hi, thanks for the answers.
Gautam you are right, I am using wordpress. Sorry and thanks again.