Warning: sprintf() [function.sprintf] Error Message

Hi,

I get the following error messages below the blog title post, and have no idea how to fix this. The blog is at http://www.christinekahane.com/blog. Thanks in advance!

Warning: sprintf() [function.sprintf]: Too few arguments in /home/content/82/6883882/html/blog/wp-content/themes/christinekahane/functions.php on line 473

Warning: sprintf() [function.sprintf]: Too few arguments in /home/content/82/6883882/html/blog/wp-content/themes/christinekahane/functions.php on line 478