Tech with Jagmeet

• You must remove all users with password before setting the containment property to NONE.

Resolution:
Looks like some references from previous installation exist in the system. Run Uninstall Sitecore installation script and then install. Or install with a different name

• Error requesting http://sitename/sitecore/admin/PopulateManagedSchema.aspx?indexes=all . The remote returned the error 500, internal server error.
  Resolution:
  Enable ASP, ASP.net 3.5 and ASP.net 4.7. If it does not get resolved, then check for url rewrite and install it.