Adding Asides With No Plugin Use Problem???

I’m in the process of seting up asides using the direction from this page: https://codex.www.ads-software.com/Adding_Asides. I’m not using a plugin I’m changing the php myself.

I followed the Matt’s asides set-by-step and I’m getting the following error messege.

Parse error: syntax error, unexpected T_ENDWHILE in /home/.squeakers/ccraig/www.booksnchocolate.com/wp-content/themes/WP_Premium/index.php on line 72

Is there something wrong with the instructions or is this a mistake I made or something with the template and maybe I can’t use asides with the template I use???

Thanks to anyone who helps.

My site: https://www.booksnchocolate.com