I can't load any page in the editor. AEM is complaining in my browser console that a component doesn't exist. That component is from a previous AEM installation. Why does my new installation still have a reference to this old component?
granite.js:234 GET http://localhost:4502/content/connectapp/en/DashboardBanner/jcr:content/par/banner.html?forceeditcontext=true&_=1605590388793 404 (Not Found)
Though the component doesn't exist, the page you are trying to access might have the reference of the old component. Go to crxde check and try to delete the reference(/content/connectapp/en/DashboardBanner/jcr:content/par/banner) of the component under the page.