KeyNotFoundException with RavenDb - asp.net-mvc-5

Question

Just installed RavenDb Build-3528 as a Website in IIS.
RavenDb is running just fine, management studio is reachable on http://localhost:8080, created databases etc, so far no problem.
However when I start my MVC 5 application (with regular MVC Controllers and WebApi Controllers) the application crashes on startup with the json message:
{
message: "An error has occurred.",
exceptionMessage: "The given key was not present in the dictionary.",
exceptionType: "System.Collections.Generic.KeyNotFoundException",
stackTrace: " at System.Collections.Concurrent.ConcurrentDictionary`2.get_Item(TKey key) at Raven.Database.Server.Controllers.RavenBaseApiController.InnerInitialization(HttpControllerContext controllerContext) in c:\Builds\RavenDB-Stable-3.0\Raven.Database\Server\Controllers\RavenBaseApiController.cs:line 101 at Raven.Database.Server.Controllers.RavenDbApiController.InnerInitialization(HttpControllerContext controllerContext) in c:\Builds\RavenDB-Stable-3.0\Raven.Database\Server\Controllers\RavenDbApiController.cs:line 112 at Raven.Database.Server.Controllers.RavenDbApiController.<ExecuteAsync>d__3a.MoveNext() in c:\Builds\RavenDB-Stable-3.0\Raven.Database\Server\Controllers\RavenDbApiController.cs:line 54 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult() at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__1.MoveNext()"
}
Funny thing is: before installing RavenDb as Website in IIS we used RavenDb 2.5 as embedded server in our MVC application and worked just fine.
In the Windows Event Manager I can't find any useful information.
Anyone an idea what's going on?

Answer 1

Hah!
It turns out that if you comment out the following line in WebApiConfig.cs that error disappears:
// Web API routes
config.MapHttpAttributeRoutes(); // <--- Offending line
Apparently RavenDB calls MapHttpAttributeRoutes() as well so there's a conflict...
Of course, commenting out that line means that the WebApi routes no longer work, throwing an Multiple actions were found that match the request error.
UPDATE
On my solution there is a project with Unit Tests that requires Raven.Database.dll because it uses the EmbeddableDocumentStore to run tests in memory.
This Raven.Database.dll ends up on the bin folder of the MVC/WebApi project. As soon as you delete it, the website works. So it really is the EmbeddableDocumentStore wrecking havoc with WebApi.
In short, make sure you have no references to Raven.Database.dll in your WebApi projects, and that the dll doesn't end up in the bin of your WebApi project either (by setting Copy to Local = false, for instance).
UPDATE 2
It turns out that somehow my main project had a reference to the test project, that's why Raven.Database.dll ended up in my main project's bin folder. Just removing that unnecessary reference does the trick, no neet to set Copy to Local = false.