Jayakrishnan,
Yeah, we'll need to see the site's configuration to diagnose this any further.
From some Google searches, the only reasons we've found that could be possible causes are:
1) You're using a Smarty template (or a template based on the Smarty template engine). If so, there are some recommendations on how to fix. Also, if so, please try setting your template to a different default one and try again to see if that fixes the problem.
2) You transferred Joomla, JFBConnect, or JomSocial to your site through FTP and installed it from there (Not using the Joomla installer with a big zip file). If so, some of the files weren't transferred in ASCII format, and so are corrupted. If so, you'll need to replace any files you transferred like that (or simply re-install the components)
If any of the above sound familiar, please let us know, as it will help us narrow down solutions.
To send us site details, please Private Message them to us. You can do so by hitting the arrow under my picture (<----) and hitting the mail icon.
Thanks,
Alex