Error while viewing pages after activating this plugin…

Hi,
I am getting the following error when I try to view any page after activating this plugin. But everything works fine if I deactivate this plugin.

Warning: preg_match() expects parameter 2 to be string, object given in /home/content/57/5175357/html/wp-includes/post-template.php on line 197

Catchable fatal error: Object of class stdClass could not be converted to string in /home/content/57/5175357/html/wp-includes/post-template.php on line 211

Can you please give me a solution for this error ???

Thanks in advance for help

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