Assembly XXX which has a higher version than referenced assembly XXX

Question

I am trying to build a project using latest version of Prism and Unity but, it gives below error. How to fix below error?

Assembly 'Microsoft.Practices.Prism.UnityExtensions, Version=4.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' uses 'Microsoft.Practices.Unity, Version=3.0.1208.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' which has a higher version than referenced assembly 'Microsoft.Practices.Unity, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' c:\\Prism4.1\\Bin\\Desktop\\Microsoft.Practices.Prism.UnityExtensions.dll HelloWorld.Desktop

Answer 1

This is a problem between Unity and Prism.

Apparently, when the version of Prism for .NET 4.5 was built they were using a version of Unity signed with a version number of 3.0.1208.0 . However, in the latest releases of Unity it seems that they reset that number back to 3.0.0.0 , which is causing this error as the latest version of Unity has a lower version number that the previous one.

There is a thread in the CodePlex forums for Prism mentioning this with a couple of workarounds for it:

• Prism 4.5 and Unity 3.0