A few things to note that I've tried:

• Deleting deployed files and redeploying to Azure.
• Ensured that the StructureMap configuration is all in an InitializationModule (still as it was from AlloyDemoKit https://github.com/episerver/AlloyDemoKit/blob/master/src/AlloyDemoKit/Business/Initialization/DependencyResolverInitialization.cs).
• Logs are set to "Error" and have no entries when this happens.

Also, everything else seems fully functional - media works otherwise. And I should say that existing media was there from when I did my initial upload to blob storage from my local - and all that existing media works correctly.

Okay, I figured this out! :)

First things to clear up that I didn't realise:

• This was also happening on my local, not just Azure, but it hadn't been happening previously which lead me to believe it was only broken in Azure.. Which leads me to:
• I believe this started happening after I upgraded the solution to episerver v10.x (I was on v9.x before)

What I figured out is that if I called ServiceLocator.Current.GetInstance<EPiServer.DataAbstraction.ContentTypeRepository>() it would get:

No default Instance is registered and cannot be automatically determined for type 'EPiServer.DataAbstraction.ContentTypeRepository'

There is no configuration specified for EPiServer.DataAbstraction.ContentTypeRepository

So, I realised that something in the media upload meant there was a call to service locator asking for ContentTypeRepository. So I simply added this to my DependencyResolverInitialization code (structuremap configuration):

container.For<ContentTypeRepository>().Use<DefaultContentTypeRepository>();

And voilà! It is all happy now :)

Hope this helps someone if they stumble into this (I googled and couldn't find anyone with this exact exception).

It also didn't work using the interface, IContentTypeRepository? That's the preferred way.

Hi Jeroen

Yeah, quite right, IContentTypeRepository does work and is what should be used. But in my situation this error was happening when uploading media - so there must be some Episerver (or AlloyDemoKit?) code that must use "ContentTypeRepository" instead.. So since I don't think it was my code (code be wrong?) I didn't have a choice but to tell Structure Map to give the DefaultContentTypeRepository if that was requested.

Thanks for the reply :)

Matt