Theme RT 20 content-none.php

When using the search bar to locate SKU or out of stock inventory it gives this error instead of the redirect to a sorry we are out page or something of that type.

Error:

Fatal error: Call to undefined function esc_htmlesc_html_e() in /home3/ems/public_html/wp-content/themes/rt-theme-20/content-none.php on line 15

This is the coding for said page:

<?php
/*
* rt-theme content-none.php
* nothing found
*/
?>

<?php if ( is_home() && current_user_can( 'publish_posts' ) ) : ?>

<p><?php printf( esc_html__( 'Ready to publish your first post? <a href="%1$s">Get started here</a>.', 'rt-theme-20' ), admin_url( 'post-new.php' ) ); ?></p>

<?php elseif ( is_search() ) : ?>

<p><?php esc_htmlesc_html_e( 'Sorry, but nothing matched your search terms. Please try again with some different keywords.', 'rt-theme-20' ); ?></p>
<?php get_search_form(); ?>

<?php else : ?>

<p><?php esc_htmlesc_html_e( 'It seems we can’t find what you’re looking for. Perhaps searching can help.', 'rt-theme-20' ); ?></p>
<?php get_search_form(); ?>

<?php endif; ?>

[Moderator Note: Please post code & markup between backticks or use the code button. Your posted code has now been damaged by the forum’s parser.]

How can I fix this?