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POCS0246 and CS0433 errors when building .NET 4.0 website on Server 2012
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copied!<p>I am building a .Net 4.0 web project on Server 2012 with .Net 4.5 installed. I am using Psake under TeamCity and am getting CS0246 saying NotMapped could not be found, along with CS0433 saying it has found two DLLs for DataAnnotations.</p> <p>The class looks like this:</p> <pre><code>using System.ComponentModel.DataAnnotations.Schema; public abstract class Order { [NotMapped] public decimal TaxPercentage { get; set; } } </code></pre> <p>The full errors are:</p> <pre><code>Ordering\Order.cs(105,8): error CS0246: The type or namespace name 'NotMapped' could not be found (are you missing a using directive or an assembly reference?) [C:\TeamCity\buildAgent\work\71c853cb9b4c108\Code\Models\Model.csproj] Ordering\Order.cs(105,8): error CS0433: The type 'System.ComponentModel.DataAnnotations.Schema.NotMappedAttribute' exists in both 'c:\TeamCity\buildAgent\work\71c853cb9b4c108\Code\packages\EntityFramework.5.0.0\lib\net40\EntityFramework.dll' and 'c:\Windows\Microsoft.NET\assembly\GAC_MSIL\System.ComponentModel.DataAnnotations\v4.0_4.0.0.0__31bf3856ad364e35\System.ComponentModel.DataAnnotations.dll' [C:\TeamCity\buildAgent\work\71c853cb9b4c108\Code\Models\Model.csproj] </code></pre> <p>The build works fine under Windows 8 using just Psake and not TeamCity. Any ideas how to resolve this?</p> <p>Update: I've made a smaller test <a href="https://bitbucket.org/seankearon/ef-build-test" rel="nofollow">project</a> and this builds fine on 2012. Looks like there's something weird with my main project.</p>

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