XSD doesn't allow to build

Question

I'm working on an ASP.NET project with another developer. He has added an XSD file to the solution file (.sln). He can build the application on his machine successful, while I cant build on my machine, considering that we share the exact same code.

I get the following error:

Error 1 Failed to generate code. Exception of type 'System.Data.Design.InternalException' was thrown. C:\projectsSources\dotnet\CMS\CMS_default\App_Code\Communication_Summary.xsd 1

Any idea why?