After upgrading to 7.4.0 I get an object reference... error whenever I try to do any page operations, like Page Settings, Page Appearance, Page Permissions, Add New Page or Copy Page. Here is the log:

ExceptionHash:qWxhGHr92qtgyN/MJVKHUg==

Message:Object reference not set to an instance of an object.

StackTrace:

InnerMessage:Object reference not set to an instance of an object.

InnerStackTrace:
at DotNetNuke.Security.Permissions.PermissionProvider.DefaultImplicitRoles(Int32 portalId)
at DotNetNuke.Security.Permissions.PermissionProvider.ImplicitRolesForPages(Int32 portalId)
at DotNetNuke.Security.Permissions.Controls.TabPermissionsGrid.IsImplicitRole(Int32 portalId, Int32 roleId)
at DotNetNuke.Security.Permissions.Controls.TabPermissionsGrid.GetEnabled(PermissionInfo objPerm, RoleInfo role, Int32 column)
at DotNetNuke.Security.Permissions.Controls.PermissionsGrid.BindRolesGrid()
at DotNetNuke.Security.Permissions.Controls.PermissionsGrid.BindData()
at DotNetNuke.Security.Permissions.Controls.PermissionsGrid.OnPreRender(EventArgs e)
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)