Cannot resolve dependencies for the following module(s) PageTypeB

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After an upgrade from EPiServer 5 to EpiServer 6 R2 and adding PageTypeBuilder-dll's I get the following error:

Cannot resolve dependencies for the following module(s) PageTypeBuilder.Initializer Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.InvalidOperationException: Cannot resolve dependencies for the following module(s) PageTypeBuilder.Initializer Source Error: [No relevant source lines] Source File: c:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\87acb86c\7104e381\App_global.asax.ri5bc7qn.0.cs Line: 0 Stack Trace:

[InvalidOperationException: Cannot resolve dependencies for the following module(s) PageTypeBuilder.Initializer] EPiServer.Framework.Initialization.InitializationEngine.CreateDependencySortedModules(IEnumerable`1 modules) +312 EPiServer.Framework.Initialization.InitializationEngine.Initialize(HostType hostType) +37 EPiServer.Framework.Initialization.InitializationModule.Initialize(HostType hostType) +163 EPiServer.Framework.Initialization.InitializationModule.FrameworkInitialization(HostType hostType) +68 EPiServer.Global..ctor() +54 ASP.global_asax..ctor() in c:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\87acb86c\7104e381\App_global.asax.ri5bc7qn.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) +98 System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean skipCheckThis, Boolean fillCache) +241 System.Activator.CreateInstance(Type type, Boolean nonPublic) +69 System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes) +1136 System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes) +111 System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture) +23 System.Web.HttpRuntime.CreateNonPublicInstance(Type type, Object[] args) +60 System.Web.HttpApplicationFactory.GetNormalApplicationInstance(HttpContext context) +227 System.Web.HttpApplicationFactory.GetApplicationInstance(HttpContext context) +107 System.Web.HttpRuntime.ProcessRequestInternal(HttpWorkerRequest wr) +327