Theme Soft Reject

Hello everyone,
My WP theme has soft rejected and they gave me one screenshot. Could you please help me to find it out from it. This is the screenshot

I did find any notice in my site.
I called my file which is now in my theme folder/header.
I called it in my header.php file.

<?php get_template_part( 'header/william', 'banner' ); ?>

Please help me.
Thanks in advance.

william-banner.php may have a function that is not needed.