如标题，出错的信息如下，但是在Outlook中点击"收件人"，全球通讯录什么的都可以出来的。请大家协助，谢谢！
Exception
Exception type: System.NullReferenceException
Exception message: 未将对象引用设置到对象的实例。
Call stack
在 Microsoft.Exchange.Data.Directory.SystemConfiguration.AddressBookBase.GetAllRoomsAddressList(ClientSecurityContext clientSecurityContext, ADSystemConfigurationSession configurationSession) 在 Microsoft.Exchange.Clients.Owa.Core.UserContext.get_AllRoomsAddressList()
在 Microsoft.Exchange.Clients.Owa.Core.Directory.DirectoryAssistance.GetAllRoomsAddressBookInfo(UserContext userContext) 在 Microsoft.Exchange.Clients.Owa.Core.UserContext.get_AllRoomsAddressBookInfo() 在 Microsoft.Exchange.Clients.Owa.Premium.Controls.SecondaryNavigationDirectoryList.CreateCondensedDirectoryList(UserContext
userContext, Boolean isRoomPicker) 在 Microsoft.Exchange.Clients.Owa.Premium.DirectoryView.RenderSecondaryNavigation(TextWriter output, UserContext userContext, Boolean isRoomPicker) 在 Microsoft.Exchange.Clients.Owa.Premium.Controls.NavigationHost.RenderSecondaryNavigation(TextWriter
output, Boolean showContacts) 在 ASP.forms_premium_addressbook_aspx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) 在 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) 在 System.Web.UI.Page.Render(HtmlTextWriter
writer) 在 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
