After installing Episerver.Find.Commerce.9.6.1, get LoaderExceptions error

Description

Cleaning bin folder, rebuilding, clearing temporary files did not resolve this.
(The issue does not occur on a site with hostname running on a setup in IIS - only through VS.)

Steps to reproduce
1. Set up a Quicksilver commerce site.
2. Install EPiServer.Find.Commerce 9.6.1.
3. Upgrade to Episerver.Commerce.9.20.
4. Build.
5. Run site from Visual Studio web server.
6. Get error below.

[ReflectionTypeLoadException: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.]
System.Reflection.RuntimeModule.GetTypes(RuntimeModule module) +0
System.Reflection.RuntimeModule.GetTypes() +9
System.Reflection.Assembly.GetTypes() +70
EPiServer.Find.ClientConventions.<>c_DisplayClass5.<MarkAllImplementationsAsNested>b_3(Assembly a) +23
EPiServer.Find.Helpers.ListExtensions.ForEach(IEnumerable`1 value, Action`1 action) +130
EPiServer.Find.ClientConventions.NestedConventions.MarkAllImplementationsAsNested(Type declaringType, String name) +139
EPiServer.Find.ClientConventions.NestedConventions.ForInstancesOf(Expression`1 exp) +57
EPiServer.Find.ClientConventions.NestedConventionItemInstanceWrapper`1.Add(Expression`1 expr) +59
EPiServer.Find.Commerce.CatalogContentClientConventions.ApplyNestedConventions(NestedConventions nestedConventions) +222
EPiServer.Find.Commerce.CatalogContentClientConventions.ApplyConventions(IClientConventions clientConventions) +53
EPiServer.Find.Commerce.FindCommerceInitializationModule.Initialize(InitializationEngine context) +66
EPiServer.Framework.Initialization.Internal.<>c_DisplayClass3_0.<Initialize>b_0() +19
EPiServer.Framework.Initialization.Internal.ModuleNode.Execute(Action a, String key) +52
EPiServer.Framework.Initialization.Internal.ModuleNode.Initialize(InitializationEngine context) +80
EPiServer.Framework.Initialization.InitializationEngine.InitializeModules() +245

[InitializationException: Initialize action failed for Initialize on class EPiServer.Find.Commerce.FindCommerceInitializationModule, EPiServer.Find.Commerce, Version=9.6.1.0, Culture=neutral, PublicKeyToken=8fe83dea738b45b7]
EPiServer.Framework.Initialization.InitializationEngine.InitializeModules() +511
EPiServer.Framework.Initialization.InitializationEngine.ExecuteTransition(Boolean continueTransitions) +114
EPiServer.Framework.Initialization.InitializationEngine.Initialize() +32
EPiServer.Framework.Initialization.<>c.<FrameworkInitialization>b__7_0(InitializationEngine e) +9
EPiServer.Framework.Initialization.InitializationModule.EngineExecute(HostType hostType, Action`1 engineAction) +366
EPiServer.Framework.Initialization.InitializationModule.FrameworkInitialization(HostType hostType) +170
EPiServer.Global..ctor() +76
EPiServer.Reference.Commerce.Site.Global..ctor() +29
ASP.global_asax..ctor() in c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\vs\579e3c27\419403bd\App_global.asax.hsqtpepf.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) +119
System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark) +232
System.Activator.CreateInstance(Type type, Boolean nonPublic) +83
System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, StackCrawlMark& stackMark) +1117
System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes) +124
System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture) +20
System.Web.HttpRuntime.CreateNonPublicInstance(Type type, Object[] args) +60
System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) +263
System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) +296

[HttpException (0x80004005): Exception has been thrown by the target of an invocation.]
System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +9923088
System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +90
System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +261