Problem with latest comments (undefined function)

I get this error messages after my Latest Comments

Fatal error: Call to undefined function: blc_latest_comments() in Line 68 os Siebar.php

…and this is what line 68- states:

• <h2><img src=”<?php bloginfo(‘stylesheet_directory’); ?>/images/dir.gif” width=”16″ height=”12″><?php _e(‘Latest Comments’); ?></h2>

<?php blc_latest_comments(5); ?>

• <h2><img src=”<?php bloginfo(‘stylesheet_directory’); ?>/images/dir.gif” width=”16″ height=”12″><?php _e(‘Calendar of Entries’); ?></h2>
  <?php wp_timeline(); ?>
  </div>

  Any idea where I am going wrong?