Hi!

I've upgraded EPiServer 7.5 [7.5.394.2] to 8 [8.0.0] via Visual Studio 2015 and Nuget.

After trying to browse the site after a successful build I get the following error:

[InitializationException: While loading .NET types from "EPiServer.Scheduler" the following error(s) was reported:

     - System.MissingMethodException: Method not found: 'Void EPiServer.Framework.IInitializableModule.Preload(System.String[])'.

]
   EPiServer.Framework.Initialization.InitializationExceptionHelper.ThrowFriendlyTypeScannerException(IEnumerable`1 reflectionExceptions, IEnumerable`1 addonsWithErrors) +114
   EPiServer.Framework.Initialization.InitializationModule.Initialize(HostType hostType) +1374
   EPiServer.Framework.Initialization.InitializationModule.FrameworkInitialization(HostType hostType) +103
   EPiServer.Global..ctor() +108
   Elmia.Global..ctor() +43
   ASP.global_asax..ctor() in c:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\8724ee91\94ddd343\App_global.asax.0.cs:0

[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) +138
   System.Activator.CreateInstance(Type type, Boolean nonPublic) +105
   System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, StackCrawlMark& stackMark) +1481
   System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes) +191
   System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture) +27
   System.Web.HttpRuntime.CreateNonPublicInstance(Type type, Object[] args) +82
   System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) +300
   System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) +343

[HttpException (0x80004005): Exception has been thrown by the target of an invocation.]
   System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +579
   System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +112
   System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +712

In the breaking changes section for EPiServer 8 it says:

Unless you have an explicit interface implementation, no change is required since the method has never been called.
Preload has never been called and was created to be used in the future. It was removed to fix code.

I noticed I had implemented two empty Preload methods so I removed them. However, it didn't make the error go away.

Any advice on how to proceed?