First, I'm hoping that you've made a 'clone' (see Clone a Template) of the built-in responsive_classic template for your store!
In either case, you can correct that issue by editing your template's /common/html_header.php. Find this section (towards the bottom-middle of that file):
Code:
/** CDN for jQuery core **/
?>
<script type="text/javascript">window.jQuery || document.write(unescape('%3Cscript type="text/javascript" src="https://code.jquery.com/jquery-3.4.0.min.js" integrity="sha256-BJeo0qm959uMBGb65z40ejJYGSgR7REI4+CW1fNKwOg=" crossorigin="anonymous"%3E%3C/script%3E'));</script>
<?php if (file_exists(DIR_WS_TEMPLATE . "jscript/jquery.min.js")) { ?>
<script type="text/javascript">window.jQuery || document.write(unescape('%3Cscript type="text/javascript" src="<?php echo $template->get_template_dir('.js',DIR_WS_TEMPLATE, $current_page_base,'jscript'); ?>/jquery.min.js"%3E%3C/script%3E'));</script>
<?php } ?>
<script type="text/javascript">window.jQuery || document.write(unescape('%3Cscript type="text/javascript" src="<?php echo $template->get_template_dir('.js','template_default', $current_page_base,'jscript'); ?>/jquery.min.js"%3E%3C/script%3E'));</script>
and change that to:
Code:
/** CDN for jQuery core **/
?>
<script type="text/javascript" src="https://code.jquery.com/jquery-3.4.0.min.js" integrity="sha256-BJeo0qm959uMBGb65z40ejJYGSgR7REI4+CW1fNKwOg=" crossorigin="anonymous"></script>
That will make that issue 'go away' but will prevent your store from operating should the jQuery CDN be unavailable.
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