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    <p>I'm sorry I cant answer your question but I can confirm that I get a very similar problem with our large Silverlight application that also makes heavy use of WCF RIA Services. Every so often when the app pool recycles due it's scheduled recycle I see the following type of exceptions in the event log on the IIS server.</p> <blockquote> <p>WebHost failed to process a request. Sender Information: System.ServiceModel.ServiceHostingEnvironment+HostingManager/12036987 Exception: System.ServiceModel.ServiceActivationException: The service '/Services/DomainServices-Web-ServiceLayer-ReportsDomainService.svc' cannot be activated due to an exception during compilation. The exception message is: Invalid Include specification for member 'Activity.ActivitySourceType'. Non-projection includes can only be specified on members with the AssociationAttribute applied.. ---> System.InvalidOperationException: Invalid Include specification for member 'Activity.ActivitySourceType'. Non-projection includes can only be specified on members with the AssociationAttribute applied. at System.ServiceModel.DomainServices.Server.DomainServiceDescription.ValidateEntityTypes() at System.ServiceModel.DomainServices.Server.DomainServiceDescription.Initialize() at System.ServiceModel.DomainServices.Server.DomainServiceDescription.CreateDescription(Type domainServiceType) at System.Collections.Concurrent.ConcurrentDictionary<code>2.GetOrAdd(TKey key, Func</code>2 valueFactory) at System.ServiceModel.DomainServices.Server.DomainServiceDescription.GetDescription(Type domainServiceType) at System.ServiceModel.DomainServices.Hosting.DomainServiceHost..ctor(Type domainServiceType, Uri[] baseAddresses) at System.ServiceModel.DomainServices.Hosting.DomainServiceHostFactory.CreateServiceHost(Type serviceType, Uri[] baseAddresses) at System.ServiceModel.Activation.ServiceHostFactory.CreateServiceHost(String constructorString, Uri[] baseAddresses) at System.ServiceModel.ServiceHostingEnvironment.HostingManager.CreateService(String normalizedVirtualPath) at System.ServiceModel.ServiceHostingEnvironment.HostingManager.ActivateService(String normalizedVirtualPath) at System.ServiceModel.ServiceHostingEnvironment.HostingManager.EnsureServiceAvailable(String normalizedVirtualPath) --- End of inner exception stack trace ---<br> at System.ServiceModel.ServiceHostingEnvironment.HostingManager.EnsureServiceAvailable(String normalizedVirtualPath) at System.ServiceModel.ServiceHostingEnvironment.EnsureServiceAvailableFast(String relativeVirtualPath) Process Name: w3wp Process ID: 15172</p> </blockquote> <p>These exceptions are logged immediately after the application pool recycles and our users cannot use the application until I manually recycle the application pool again. </p> <p>Have you made any progress on this?</p> <p>Thanks Kevin</p>
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