Intermittant error: Duplicate type name within an assembly

London Dev Meetup Rescheduled! Due to unavoidable reasons, the event has been moved to 21st May. Speakers remain the same—any changes will be communicated. Seats are limited—register here to secure your spot!

[ArgumentException: Duplicate type name within an assembly.] System.Reflection.Emit.ModuleBuilder.CheckTypeNameConflict(String strTypeName, Type enclosingType) +14730529 System.Reflection.Emit.AssemblyBuilderData.CheckTypeNameConflict(String strTypeName, TypeBuilder enclosingType) +63 System.Reflection.Emit.TypeBuilder.Init(String fullname, TypeAttributes attr, Type parent, Type[] interfaces, ModuleBuilder module, PackingSize iPackingSize, Int32 iTypeSize, TypeBuilder enclosingType) +162 System.Reflection.Emit.ModuleBuilder.DefineType(String name, TypeAttributes attr, Type parent) +204 EPiServer.DataAbstraction.RuntimeModel.Internal.ContentModelILCompiler.GenerateType(Type contentType) +164 EPiServer.DataAbstraction.RuntimeModel.Internal.ContentModelILCompiler.<GetOrGenerate>b__21_0(Type type) +109 System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory) +87 EPiServer.DataAbstraction.RuntimeModel.Internal.IlGeneratedContentDataActivator.Create(Type contentDataType) +28 EPiServer.Construction.Internal.ContentDataFactory`1.CreateInstance(Type modelType) +69 EPiServer.Construction.Internal.ContentDataFactory`1.CreateInstance(ContentType contentType) +230 EPiServer.Construction.Internal.ContentDataBuilder.AddProperties(IPropertyBlock blockProperty, BlockPropertyDefinitionType blockDefintionType) +119 EPiServer.Construction.Internal.ContentDataBuilder.AddContentTypeProperties(IContentData contentData, ContentType contentType) +226 EPiServer.Construction.Internal.ContentDataBuilder.AddProperties(IContentData contentData, BuildingContext buildingContext) +163 EPiServer.Construction.Internal.ContentFactory.CreateContent(ContentType contentType, BuildingContext buildingContext) +293 EPiServer.DataAccess.Internal.ContentDB.CreateContent(ContentType contentType) +14 EPiServer.DataAccess.Internal.ContentLoadDB.LoadContentInternal(ContentReference contentLink, Int32 languageBranchId, DbDataReader reader) +279 EPiServer.DataAccess.Internal.<>c__DisplayClass4_0.<LoadVersion>b__0() +462 EPiServer.Data.Providers.Internal.<>c__DisplayClass31_0`1.<Execute>b__0() +58 EPiServer.Data.Providers.SqlTransientErrorsRetryPolicy.Execute(Func`1 method) +70 EPiServer.Core.<>c__DisplayClass127_0.<LoadContentFromCacheOrRepository>b__0() +35 EPiServer.Framework.Cache.ObjectInstanceCacheExtensions.ReadThroughWithWait(IObjectInstanceCache cache, String cacheKey, Func`1 readValue, Func`2 evictionPolicy) +1023 EPiServer.Core.Internal.ContentInstanceCache.ReadThrough(ContentReference contentLink, String selectedLanguage, Func`1 readValue) +107 EPiServer.Core.ContentProvider.LoadContentFromCacheOrRepository(ContentReference contentreference, ILanguageSelector selector) +603 EPiServer.Core.Internal.ProviderPipelineImplementation.GetItem(ContentProvider provider, ContentReference contentLink, LoaderOptions loaderOptions) +309 EPiServer.Core.Internal.DefaultContentLoader.TryGet(ContentReference contentLink, LoaderOptions loaderOptions, T& content) +574 EPiServer.Core.Internal.DefaultContentLoader.Get(ContentReference contentLink, LoaderOptions loaderOptions) +99 EPiServer.DataAbstraction.RuntimeModel.Internal.ContentTypeModelRegister.ValidateChangeOfModelType(PropertyDefinitionModel propertyModel, String modelName) +313 EPiServer.DataAbstraction.RuntimeModel.Internal.ContentTypeModelRegister.SetStateForPropertyDefinitionModels(ContentTypeModel model) +177 EPiServer.DataAbstraction.RuntimeModel.Internal.ContentTypeModelRegister.<AnalyzeProperties>b__15_0(ContentTypeModel model) +67 System.Threading.Tasks.<>c__DisplayClass17_0`1.<ForWorker>b__1() +1224 System.Threading.Tasks.Task.InnerInvokeWithArg(Task childTask) +32 System.Threading.Tasks.<>c__DisplayClass176_0.<ExecuteSelfReplicating>b__0(Object ) +272 [AggregateException: One or more errors occurred.] System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions) +4751668 System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken) +14351633 System.Threading.Tasks.Parallel.ForWorker(Int32 fromInclusive, Int32 toExclusive, ParallelOptions parallelOptions, Action`1 body, Action`2 bodyWithState, Func`4 bodyWithLocal, Func`1 localInit, Action`1 localFinally) +1402 System.Threading.Tasks.Parallel.ForEachWorker(IEnumerable`1 source, ParallelOptions parallelOptions, Action`1 body, Action`2 bodyWithState, Action`3 bodyWithStateAndIndex, Func`4 bodyWithStateAndLocal, Func`5 bodyWithEverything, Func`1 localInit, Action`1 localFinally) +367 System.Threading.Tasks.Parallel.ForEach(IEnumerable`1 source, Action`1 body) +158 EPiServer.DataAbstraction.RuntimeModel.Internal.ContentTypeModelRegister.AnalyzeProperties() +105 EPiServer.DataAbstraction.RuntimeModel.Internal.ContentTypeModelScanner.Sync(Boolean commitChanges) +298 EPiServer.Initialization.Internal.ModelSyncInitialization.Initialize(InitializationEngine context) +561 EPiServer.Framework.Initialization.Internal.ModuleNode.Execute(Action a, String key) +58 EPiServer.Framework.Initialization.Internal.ModuleNode.Initialize(InitializationEngine context) +123 EPiServer.Framework.Initialization.InitializationEngine.InitializeModules() +248 [InitializationException: Initialize action failed for Initialize on class EPiServer.Initialization.Internal.ModelSyncInitialization, EPiServer, Version=11.20.5.0, Culture=neutral, PublicKeyToken=8fe83dea738b45b7] EPiServer.Framework.Initialization.InitializationEngine.InitializeModules() +800 EPiServer.Framework.Initialization.InitializationEngine.ExecuteTransition(Boolean continueTransitions) +194 EPiServer.Framework.Initialization.InitializationModule.EngineExecute(HostType hostType, Action`1 engineAction) +876 EPiServer.Framework.Initialization.InitializationModule.FrameworkInitialization(HostType hostType) +225 EPiServer.Global..ctor() +42 DXA.Web.EPiServerApplication..ctor() in C:\dev\XX\Project\src\DXA.Web\Global.asax.cs:23 ASP.global_asax..ctor() +42 [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) +139 System.Activator.CreateInstance(Type type, Boolean nonPublic) +105 System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, StackCrawlMark& stackMark) +1431 System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes) +184 System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture) +27 System.Web.HttpRuntime.CreateNonPublicInstance(Type type, Object[] args) +80 System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) +182 System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) +369 [HttpException (0x80004005): Exception has been thrown by the target of an invocation.] System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +532 System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +111 System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +714