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The MSBuild step in TeamCity considers app.config instead of web.config for the ASP.NET WEB API project, which results in MSB3247 warning

I have an ASP.NET WEB API project with a Web.conig file. When it is created in VS2015, error and warning messages are not reported. However, when I create this project on TeamCity using the MSBuild build step, I get the warning MSB3247:

[ResolveAssemblyReferences] ResolveAssemblyReference [14:30:01] : [ResolveAssemblyReference] No way to resolve conflict between "protobuf-net, Version=2.0.0.602, Culture=neutral, PublicKeyToken=257b51d87d2e4d67" and "protobuf-net, Version=2.0.0.480, Culture=neutral, PublicKeyToken=257b51d87d2e4d67". Choosing "protobuf-net, Version=2.0.0.602, Culture=neutral, PublicKeyToken=257b51d87d2e4d67" arbitrarily. [14:30:01] : [ResolveAssemblyReference] No way to resolve conflict between "Newtonsoft.Json, Version=6.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed" and "Newtonsoft.Json, Version=4.5.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed". Choosing "Newtonsoft.Json, Version=6.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed" arbitrarily. [14:30:01] : [ResolveAssemblyReference] Consider app.config remapping of assembly "protobuf-net, Culture=neutral, PublicKeyToken=257b51d87d2e4d67" from Version "2.0.0.602" [] to Version "2.0.0.668" [D:\TeamCity\buildAgent\work\2772494ce0e0bbd7\branches\Stategic.Window.Release1\src\Strategic.Window\packages\protobuf-net.2.0.0.668\lib\net40\protobuf-net.dll] to solve conflict and get rid of warning. [14:30:01] : [ResolveAssemblyReference] Consider app.config remapping of assembly "Newtonsoft.Json, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed" from Version "6.0.0.0" [] to Version "7.0.0.0" [D:\TeamCity\buildAgent\work\2772494ce0e0bbd7\branches\Stategic.Window.Release1\src\Strategic.Window\packages\Newtonsoft.Json.7.0.1\lib\net45\Newtonsoft.Json.dll] to solve conflict and get rid of warning. [14:30:01] : [ResolveAssemblyReference] Consider app.config remapping of assembly "RazorEngine, Culture=neutral, PublicKeyToken=9ee697374c7e744a" from Version "3.0.8.0" [] to Version "3.7.4.0" [D:\TeamCity\buildAgent\work\2772494ce0e0bbd7\branches\Stategic.Window.Release1\src\Strategic.Window\packages\RazorEngine.3.7.4\lib\net45\RazorEngine.dll] to solve conflict and get rid of warning. [14:30:01] : [ResolveAssemblyReference] Consider app.config remapping of assembly "WebGrease, Culture=neutral, PublicKeyToken=31bf3856ad364e35" from Version "1.5.1.25624" [] to Version "1.5.2.14234" [D:\TeamCity\buildAgent\work\2772494ce0e0bbd7\branches\Stategic.Window.Release1\src\Strategic.Window\packages\WebGrease.1.5.2\lib\WebGrease.dll] to solve conflict and get rid of warning. [14:30:01]W: [ResolveAssemblyReference] C:\Program Files (x86)\MSBuild\14.0\bin\Microsoft.Common.CurrentVersion.targets(1819, 5): warning MSB3247: Found conflicts between different versions of the same dependent assembly. In Visual Studio, double-click this warning (or select it and press Enter) to fix the conflicts; otherwise, add the following binding redirects to the "runtime" node in the application configuration file: <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"><dependentAssembly><assemblyIdentity name="protobuf-net" culture="neutral" publicKeyToken="257b51d87d2e4d67" /><bindingRedirect oldVersion="0.0.0.0-2.0.0.668" newVersion="2.0.0.668" /></dependentAssembly></assemblyBinding><assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"><dependentAssembly><assemblyIdentity name="Newtonsoft.Json" culture="neutral" publicKeyToken="30ad4fe6b2a6aeed" /><bindingRedirect oldVersion="0.0.0.0-7.0.0.0" newVersion="7.0.0.0" /></dependentAssembly></assemblyBinding><assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"><dependentAssembly><assemblyIdentity name="RazorEngine" culture="neutral" publicKeyToken="9ee697374c7e744a" /><bindingRedirect oldVersion="0.0.0.0-3.7.4.0" newVersion="3.7.4.0" /></dependentAssembly></assemblyBinding><assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"><dependentAssembly><assemblyIdentity name="WebGrease" culture="neutral" publicKeyToken="31bf3856ad364e35" /><bindingRedirect oldVersion="0.0.0.0-1.5.2.14234" newVersion="1.5.2.14234" /></dependentAssembly></assemblyBinding>

It looks like the app.config file is being considered by MSBuild instead of Web.config because it suggests adding the bindingRedirtect that are already in my Web.config file. I double-checked this by copying Web.config and renaming it to App.config. This fixed the warning. When App.config is deleted, a warning appears. So my questions are: 1) why, although MSBuild seems to use app.config, it fails when I only have Web.config in the project; 2) How can I give MSBuild a hint to use Web.config to bind redirects? 3) why the creation of exactly the same project in VS does not give a warning?

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The problem is that Microsoft Web Developer Tools is not installed. MSBuild does not know how to properly process web.config files in this case.

Possible solutions:

  • Install Microsoft ASP.NET and Web Tools 2015 on TeamCity Server

  • Copy these folders to the TeamCity server.

    • c: \ Program Files (x86) \ MSBuild \ Microsoft \ VisualStudio \ v14.0 \ WebApplications \
    • c: \ Program Files (x86) \ MSBuild \ Microsoft \ VisualStudio \ v14.0 \ Web \

    make sure that <Import Project="$(VSToolsPath)\WebApplications\Microsoft.WebApplication.targets" Condition="'$(VSToolsPath)' != ''" /> in web csproj is correct.

The Microsoft.WebApplication.targets file refers to files in the Web folder, so it should also be in place.

The solution was compiled from here .

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