Question

I’m receiving the following error when trying to run an ASP.NET MVC 3 project:

‘ServiceHostingEnvironment.EnsureServiceAvailable’ cannot be invoked within the current hosting environment. This API requires that the calling application be hosted in IIS or WAS.

When I run the project through Visual Studio 2010 by hitting F5, it loads up just fine. I only get this error when trying to access the application through http://localhost/projectname. What’s strange is that this code base worked on my computer before I formatted and reinstalled Windows on it. Any idea what this error message means?

Here’s the stack trace if it helps at all:

[InvalidOperationException: ‘ServiceHostingEnvironment.EnsureServiceAvailable’ cannot be invoked within the current hosting environment. This API requires that the calling application be hosted in IIS or WAS.]
System.ServiceModel.ServiceHostingEnvironment.EnsureInitialized() +378
System.ServiceModel.AspNetPartialTrustHelpers.PartialTrustInvoke(ContextCallback callback, Object state) +106
System.ServiceModel.Activation.ServiceHttpModule.BeginProcessRequest(Object sender, EventArgs e, AsyncCallback cb, Object extraData) +175
System.Web.AsyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +115
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +371

UPDATE: I went ahead and created a new ASP.NET MVC 3 project using Visual Studio 2010’s templates. I added the application to IIS and tried to access it and received the same error. I’m thinking there may be something wrong with my IIS installation.

Answer 1

You might check the following blog post.

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UPDATE:

The problem seems to be related to the installation of .NET 4.0. Reinstalling it fixes the issue.