Hi,

After upgrading to EpiSever 10.3.0 I get an initialization error in our test-environment. On my developer-machine the site works fine. It looks like it has to do with System.Threading.Tasks.Dataflow.dll missing. Does anyone have a clue how to solve this? 

EPiServer.Framework.Initialization.InitializationEngine: Initialize action failed for 'Initialize on class EPiServer.Shell.UI.InitializationModule, EPiServer.Shell.UI, Version=10.3.1.0, Culture=neutral, PublicKeyToken=8fe83dea738b45b7'
StructureMap.Building.StructureMapBuildException: Error while building type EPiServer.Notification.Internal.DefaultNotifier. See the inner exception for details
1.) new DefaultNotifier(*Default of INotificationUserRepository*, *Default of INotificationRepository*, Enumerable of EPiServer.Notification.INotificationFormatter with all registered instances, *Default of QueryableNotificationUserService*, *Default of INotificationChannelOptionsRegistry*, *Default of INotificationDispatcher*)
2.) EPiServer.Notification.Internal.DefaultNotifier
3.) Instance of EPiServer.Notification.INotifier (EPiServer.Notification.Internal.DefaultNotifier)
4.) new ProjectMessageNotifier(*Default of INotifier*, *Default of ProjectActivityFeed*, *Default of ActivityCommentRepository*, *Default of IObjectSerializerFactory*, *Default of MentionParser*, *Default of ProjectService*, *Default of ISubscriptionService*)
5.) EPiServer.Cms.Shell.UI.Rest.Projects.Notifications.Internal.ProjectMessageNotifier
6.) Instance of EPiServer.Shell.UI.Internal.IEventListener (EPiServer.Cms.Shell.UI.Rest.Projects.Notifications.Internal.ProjectMessageNotifier)
7.) Container.GetAllInstances(EPiServer.Shell.UI.Internal.IEventListener)
---> System.IO.FileNotFoundException: Could not load file or assembly 'System.Threading.Tasks.Dataflow, Version=4.5.24.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.
at EPiServer.Notification.Internal.DefaultNotifier.InitProcessingQueue()
at lambda_method(Closure , IBuildSession , IContext )
--- End of inner exception stack trace ---
at lambda_method(Closure , IBuildSession , IContext )
at StructureMap.Building.BuildPlan.Build(IBuildSession session, IContext context) in c:\BuildAgent\work\a395dbde6b793293\src\StructureMap\Building\BuildPlan.cs:line 151
at StructureMap.Pipeline.LifecycleObjectCache.Get(Type pluginType, Instance instance, IBuildSession session) in c:\BuildAgent\work\a395dbde6b793293\src\StructureMap\Pipeline\LifecycleObjectCache.cs:line 71
at StructureMap.SessionCache.GetObject(Type pluginType, Instance instance, ILifecycle lifecycle) in c:\BuildAgent\work\a395dbde6b793293\src\StructureMap\SessionCache.cs:line 93
at System.Linq.Enumerable.WhereSelectArrayIterator`2.MoveNext()
at System.Linq.Buffer`1..ctor(IEnumerable`1 source)
at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)
at StructureMap.Container.GetAllInstances(Type pluginType) in c:\BuildAgent\work\a395dbde6b793293\src\StructureMap\Container.cs:line 376
at EPiServer.ServiceLocation.StructureMapServiceLocator.d__4.MoveNext()
at EPiServer.ServiceLocation.ServiceLocatorImplBase.d__10`1.MoveNext()
at EPiServer.Shell.UI.InitializationModule.Initialize(InitializationEngine context)
at EPiServer.Framework.Initialization.Internal.ModuleNode.Execute(Action a, String key)
at EPiServer.Framework.Initialization.InitializationEngine.InitializeModules()
StructureMap.Building.StructureMapBuildException: Error while building type EPiServer.Notification.Internal.DefaultNotifier. See the inner exception for details
1.) new DefaultNotifier(*Default of INotificationUserRepository*, *Default of INotificationRepository*, Enumerable of EPiServer.Notification.INotificationFormatter with all registered instances, *Default of QueryableNotificationUserService*, *Default of INotificationChannelOptionsRegistry*, *Default of INotificationDispatcher*)
2.) EPiServer.Notification.Internal.DefaultNotifier
3.) Instance of EPiServer.Notification.INotifier (EPiServer.Notification.Internal.DefaultNotifier)
4.) new ProjectMessageNotifier(*Default of INotifier*, *Default of ProjectActivityFeed*, *Default of ActivityCommentRepository*, *Default of IObjectSerializerFactory*, *Default of MentionParser*, *Default of ProjectService*, *Default of ISubscriptionService*)
5.) EPiServer.Cms.Shell.UI.Rest.Projects.Notifications.Internal.ProjectMessageNotifier
6.) Instance of EPiServer.Shell.UI.Internal.IEventListener (EPiServer.Cms.Shell.UI.Rest.Projects.Notifications.Internal.ProjectMessageNotifier)
7.) Container.GetAllInstances(EPiServer.Shell.UI.Internal.IEventListener)
---> System.IO.FileNotFoundException: Could not load file or assembly 'System.Threading.Tasks.Dataflow, Version=4.5.24.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.
at EPiServer.Notification.Internal.DefaultNotifier.InitProcessingQueue()
at lambda_method(Closure , IBuildSession , IContext )
--- End of inner exception stack trace ---
at lambda_method(Closure , IBuildSession , IContext )
at StructureMap.Building.BuildPlan.Build(IBuildSession session, IContext context) in c:\BuildAgent\work\a395dbde6b793293\src\StructureMap\Building\BuildPlan.cs:line 151
at StructureMap.Pipeline.LifecycleObjectCache.Get(Type pluginType, Instance instance, IBuildSession session) in c:\BuildAgent\work\a395dbde6b793293\src\StructureMap\Pipeline\LifecycleObjectCache.cs:line 71
at StructureMap.SessionCache.GetObject(Type pluginType, Instance instance, ILifecycle lifecycle) in c:\BuildAgent\work\a395dbde6b793293\src\StructureMap\SessionCache.cs:line 93
at System.Linq.Enumerable.WhereSelectArrayIterator`2.MoveNext()
at System.Linq.Buffer`1..ctor(IEnumerable`1 source)
at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)
at StructureMap.Container.GetAllInstances(Type pluginType) in c:\BuildAgent\work\a395dbde6b793293\src\StructureMap\Container.cs:line 376
at EPiServer.ServiceLocation.StructureMapServiceLocator.d__4.MoveNext()
at EPiServer.ServiceLocation.ServiceLocatorImplBase.d__10`1.MoveNext()
at EPiServer.Shell.UI.InitializationModule.Initialize(InitializationEngine context)
at EPiServer.Framework.Initialization.Internal.ModuleNode.Execute(Action a, String key)
at EPiServer.Framework.Initialization.InitializationEngine.InitializeModules()