Could you share the original content.xml  and the updated one (via Google drive).

Error is reported from main.js (loaded on top of the page)And clientlibs_base.js is loaded at the end of the page. You might need to look into ordering of the client libraries in which they are included in the page.

Make sure cq.widgets is added as dependency in your client lib.dependenciesString[]cq.widgets

If this component is fixed in the editable template, then policy can be set to allow specific components which can be used within this container component.Responsive grid can be used as container component or it can hold you customized container component.<responsivegrid     jcr:primaryType="nt:unst...

Here is the sample code to retrieve login token from AEM to make calls to secured servlets.How to make a http request to get the auth token in AEM · GitHub