hii same problem
I am using King composer in my site and Email Subscribers & Newsletters plugin is updated to latest version i.e 3.5.14 still when I am trying to send subscribe, getting below error.
(index):137 Uncaught ReferenceError: es_submit_pages is not defined
at HTMLButtonElement.onclick ((index):137)
the website is https://www.gtsolution.site
thank you