How Can We Help?
Make sure the acymailing_module.js is present within the /media/com_acymailing/js/ directory
<script type="text/javascript" src="/media/com_acymailing/js/acymailing_module.js"></script>
This file can be optained within the com_acymailing zip file within /media/js simply copy it from there to /media/com_acymailing/js/