I have a working ASP.NET MVC 3 application. The project is built with VS 2010 and targets .NET 4.0. Now I re-targeted it to .NET 4.5 and successfully recompiled. Trying to deploy it to our test server (Windows 2008 R2 SP1) now fails:
Error Code: ERROR_APPPOOL_VERSION_MISMATCH
More Information: The application pool that you are trying to use
has the 'managedRuntimeVersion' property set to 'v4.0'.
This application requires 'v4.5'. Learn more at: http://go.microsoft.com/fwlink/?LinkId=221672#ERROR_APPPOOL_VERSION_MISMATCH.
The server has .NET 4.5 installed but there is no app pool 4.5 (because it's inplace upgrade and as I understand 4.0 pool should be fine). The client machine has VS 2012 and so Web Deploy 3 (was Web Deploy 2 previously). I also installed Web Deploy 3 to the server.
Tried to re-register ASP.NET with aspnet_regiis – no luck.
Why do I get the error and how can I fix it? This is so frustrating…
p.s.
Found similar question about RC but it does not help
Update:
Looks like this is a bug Microsoft hasn't fixed since CTP. IgnoreDeployManagedRuntimeVersion property did the trick. What a shame!
Best Answer
You can try adding this property to the project: