I am trying to add users to the Administrator role in version 4.7.0. When I select the user from the UserName list and select Add User toRole the following error is generated. This happen to the majority of Roles I attempt to add users to. Looking at the error below, can anyone see where I am going wrong?  The user DOES get added to the role, but this error is generated constantly.

Jon

[ArgumentNullException: String reference not set to an instance of a String.
Parameter name: name]
System.Globalization.CultureInfo..ctor(String name, Boolean useUserOverride) +2847773
DotNetNuke.Security.Roles.RoleController.SendNotification(UserInfo objUser, RoleInfo objRole, PortalSettings PortalSettings, String Action) +173
DotNetNuke.Security.Roles.RoleController.AddUserRole(UserInfo objUser, RoleInfo objRole, PortalSettings PortalSettings, DateTime effDate, DateTime expDate, Int32 userId, Boolean notifyUser) +180
DotNetNuke.Modules.Admin.Security.SecurityRoles.cmdAdd_Click(Object sender, EventArgs e) +529

[ModuleLoadException: Error: User Roles is currently unavailable.]
DotNetNuke.Services.Exceptions.Exceptions.ProcessModuleLoadException(String FriendlyMessage, PortalModuleBase ctrlModule, Exception exc, Boolean DisplayErrorMessage) +483
DotNetNuke.Services.Exceptions.Exceptions.ProcessModuleLoadException(PortalModuleBase ctrlModule, Exception exc, Boolean DisplayErrorMessage) +123
DotNetNuke.Services.Exceptions.Exceptions.ProcessModuleLoadException(PortalModuleBase ctrlModule, Exception exc) +7
DotNetNuke.Modules.Admin.Security.SecurityRoles.cmdAdd_Click(Object sender, EventArgs e) +560
DotNetNuke.UI.WebControls.CommandButton.RaiseClick(Object sender, EventArgs e) +20
System.Web.UI.WebControls.LinkButton.OnClick(EventArgs e) +90
System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument) +76
System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +7
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +11
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +177
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1746

[PageLoadException: Error: User Roles is currently unavailable.]
DotNetNuke.Services.Exceptions.Exceptions.ProcessPageLoadException(Exception exc, String URL) +376
DotNetNuke.Framework.PageBase.Page_Error(Object Source, EventArgs e) +483
System.Web.UI.TemplateControl.OnError(EventArgs e) +2085460
System.Web.UI.Page.HandleError(Exception e) +71
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +7341
System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +213
System.Web.UI.Page.ProcessRequest() +86
System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) +18
System.Web.UI.Page.ProcessRequest(HttpContext context) +49
ASP.default_aspx.ProcessRequest(HttpContext context) +4
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +358
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +64