Good Afetrnoon; Can someone help me with this error please,, I was doing an updated 4.7.2 to 6.0.0.. upgrade andeverything is fine but when run website ..

Line 36: private static readonly List

Stack Trace:

[NullReferenceException: Object reference not set to an instance of an object.] umbraco.cms.businesslogic.web.DocumentType.GetAllAsList() +19

[TargetInvocationException: Exception has been thrown by the target of an invocation.] System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck) +0 System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark) +142 System.Activator.CreateInstance(Type type, Boolean nonPublic) +105 System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, StackCrawlMark& stackMark) +1515 System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes) +186 System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture) +27 System.Web.HttpRuntime.CreateNonPublicInstance(Type type, Object[] args) +79 System.Web.HttpApplication.BuildIntegratedModuleCollection(List`1 moduleList) +213 System.Web.HttpApplication.GetModuleCollection(IntPtr appContext) +1086 System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers) +120 System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context) +169 System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) +372 System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) +329

[HttpException (0x80004005): Exception has been thrown by the target of an invocation.] System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +525 System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +118 System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +708