same error as seen here:
https://doc.dynamicweb.com/forum/dynamicweb-9-0-upgrade-issues/error-loading-addin-with-user-selector?PID=1605
can be fixed by adding
<script src="/Admin/Images/Controls/UserSelector/UserSelector.js" type="text/javascript"></script>
<script src="/Admin/Resources/js/layout/Actions.js" type="text/javascript"></script>
to Admin/Module/eCom_Catalog/dw7/edit/EcomOrderDiscount_Edit.aspx
Developer forum
UserGroupParameterEditor doesn't work in DiscountExtenders
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