Hi!

We are trying out Service API on our Epi Commerce version 12.12. We follow the guide here:  https://world.episerver.com/documentation/developer-guides/Episerver-Service-API/installation-and-configuration/. When browsing the site we get the following un-explanatory error: 

2021-03-05 14:32:44.445 [(null)] [1] ERROR EPiServer.Framework.Initialization.InitializationEngine.InitializeModules(:0): Initialize action failed for 'Initialize on class EPiServer.ServiceApi.IntegrationInitialization, EPiServer.ServiceApi, Version=5.3.1.0, Culture=neutral, PublicKeyToken=8fe83dea738b45b7'
System.NullReferenceException: Object reference not set to an instance of an object.
   at EPiServer.ServiceApi.IntegrationInitialization.<>c.<Initialize>b__2_0(HttpConfiguration config)
   at System.Web.Http.GlobalConfiguration.Configure(Action`1 configurationCallback)
   at EPiServer.Framework.Initialization.Internal.ModuleNode.Execute(Action a, String key)
   at EPiServer.Framework.Initialization.Internal.ModuleNode.Initialize(InitializationEngine context)
   at EPiServer.Framework.Initialization.InitializationEngine.InitializeModules()
System.NullReferenceException: Object reference not set to an instance of an object.
   at EPiServer.ServiceApi.IntegrationInitialization.<>c.<Initialize>b__2_0(HttpConfiguration config)
   at System.Web.Http.GlobalConfiguration.Configure(Action`1 configurationCallback)
   at EPiServer.Framework.Initialization.Internal.ModuleNode.Execute(Action a, String key)
   at EPiServer.Framework.Initialization.Internal.ModuleNode.Initialize(InitializationEngine context)
   at EPiServer.Framework.Initialization.InitializationEngine.InitializeModules()

Thankful for any help.