"Object reference not set to an instance of an object" when trying to access Manage Users in Authorization Store or Manage Roles in Authorization Store

Entire error:

Object reference not set to an instance of an object.
at SPSolutions.SharePoint.Delegation.ApplicationPages.MangUsrsInAuthStorePage.EnsureControls()
at SPSolutions.SharePoint.Delegation.ApplicationPages.ManUsrsInAuthStorePage.OnLoad(EventArgs e)
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Cause

This indicates that SharePoint is unable to find the Membership or Role provider in the web.config. Make sure that both the Extranet and Default zones include Membership and Role Provider sections as well as a ConnectionStrings section to connect to the membership store database and an entry in the PeoplePickerWildcards section referring to the Membership provider.

See Configuring a dual zone SharePoint site with FBA for specific details on editing the web.config files.