Server Error in '/' Application.

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[NullReferenceException: Object reference not set to an instance of an object.]
   umbraco.library.GetXmlNodeByXPath(String xpathQuery) +14

[TargetInvocationException: Exception has been thrown by the target of an invocation.]
   System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor) +0
   System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments) +92
   System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) +155
   UmbracoExamine.LegacyLibrary.GetXmlNodeByXPath(String xpathQuery) +78
   UmbracoExamine.DataServices.UmbracoContentService.GetPublishedContentByXPath(String xpath) +10
   UmbracoExamine.BaseUmbracoIndexer.GetXDocument(String xPath, String type) +89
   UmbracoExamine.BaseUmbracoIndexer.AddNodesToIndex(String xPath, String type) +20
   UmbracoExamine.BaseUmbracoIndexer.PerformIndexAll(String type) +755
   UmbracoExamine.UmbracoContentIndexer.PerformIndexAll(String type) +117
   Examine.LuceneEngine.Providers.LuceneIndexer.IndexAll(String type) +142
   UmbracoExamine.BaseUmbracoIndexer.IndexAll(String type) +29
   UmbracoExamine.BaseUmbracoIndexer.PerformIndexRebuild() +80
   UmbracoExamine.UmbracoContentIndexer.RebuildIndex() +68
   Umbraco.Web.WebBootManager.Complete(Action`1 afterComplete) +238
   Umbraco.Core.UmbracoApplicationBase.StartApplication(Object sender, EventArgs e) +158
   Umbraco.Core.UmbracoApplicationBase.Application_Start(Object sender, EventArgs e) +9

[HttpException (0x80004005): Exception has been thrown by the target of an invocation.]
   System.Web.HttpApplicationFactory.EnsureAppStartCalledForIntegratedMode(HttpContext context, HttpApplication app) +9916613
   System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers) +118
   System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context) +172
   System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) +336
   System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) +296

[HttpException (0x80004005): Exception has been thrown by the target of an invocation.]
   System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +9930508
   System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +101
   System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +254