System.NullReferenceException: Object reference not set to an instance of an object.
   at Microsoft.Xrm.Tooling.Connector.CrmServiceClient.RetrieveMultiple(QueryBase query)
   at startIT.MSCRM.Core.Services.CrmBaseService.RetrieveMultiple(String fetchXml) in
 D:\TalentWerk\iTalent\Repo\startIT.MSCRM.Core\Services\CrmBaseService.cs:line 146
   at startIT.MSCRM.Core.Services.AppRoleService.GetAppRole(String appRoleNameOrAlias) in
 D:\TalentWerk\iTalent\Repo\startIT.MSCRM.Core\Services\AppRoleService.cs:line 202
   at startIT.MSCRM.Core.Helpers.ApproleCache.GetCached(String alias, AppRoleService appRoleService) in
 D:\TalentWerk\iTalent\Repo\startIT.MSCRM.Core\Helpers\ApproleCache.cs:line 30
   at ASP._Page_Views_Partials_Events_List_cshtml.Execute() in
 D:\Plattformen\Procure\Release\Views\Partials\Events\List.cshtml:line 22
   at System.Web.WebPages.WebPageBase.ExecutePageHierarchy()
   at System.Web.Mvc.WebViewPage.ExecutePageHierarchy()
   at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage)
   at Umbraco.Core.Profiling.ProfilingView.Render(ViewContext viewContext, TextWriter writer)
   at System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model, ViewDataDictionary viewData)
   at ASP._Page_Views_Partials_Events_Index_cshtml.Execute() in
 D:\Plattformen\Procure\Release\Views\Partials\Events\Index.cshtml:line 8