In the 'PHP Code - Full List' you will see
Code:
get_search_form()
Code:
get_searchform()
The correct version to use is get_search_form()
you can fix this by editing get_whitelist.php and changing line 46 from
HTML Code:
'<?php get_searchform(); ?>' => __( 'Includes <code>searchform.php</code> sub template.', 'montezuma' ),
HTML Code:
'<?php get_search_form(); ?>' => __( 'Includes <code>searchform.php</code> sub template.', 'montezuma' ),