Build error You must add a reference to System Runtime

Question

I m preparing a brand new ASP NET MVC 5 1 solution  I m adding in a bunch of NuGet packages and setting it up with Zurb Foundation  etc  As part of that  I ve added a reference to an in-house NuGet package which is a Portable Class Library and I think this is causing a problem on the build server  TeamCity fails the build with   The type  System Object  is defined in an assembly that is not referenced  You must add a reference to assembly  System Runtime  Version 4 0 0 0  I originally added the fix for the same or similar error when compiling the Razor web pages  that fix being in the web config  lt compilation      gt     lt assemblies gt       lt add assembly  quot System Runtime  Version 4 0 0 0  Culture neutral  PublicKeyToken b03f5f7f11d50a3a quot    gt     lt  assemblies gt   lt  compilation gt   However  the issue is unresolved

User · Answer

The only way that worked for me - add the assembly to web config  lt compilation debug  quot true quot  targetFramework  quot 4 5 quot  gt     lt assemblies gt            lt add assembly  quot System Runtime  Version 4 0 0 0  Culture neutral  PublicKeyToken b03f5f7f11d50a3a quot    gt        lt  assemblies gt   lt  compilation gt

User · Answer

Install the  NET Runtime as well as the targeting pack for the  NET version you re targeting   The developer pack is just these two things bundled together but as of today doesn t seem to have a 4 6 version so you ll have to install the two items separately   Downloads can be found here  http   blogs msdn com b dotnet p dotnet sdks aspx

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To implement the fix  first expand out the existing web config compilation section that looks like this by default   lt compilation debug  quot true quot  targetFramework  quot 4 5 quot   gt   Once expanded  I then added the following new configuration XML as I was instructed     lt assemblies gt            lt add assembly  quot System Runtime  Version 4 0 0 0  Culture neutral  PublicKeyToken b03f5f7f11d50a3a quot    gt        lt  assemblies gt   The final web config tags should look like this   lt compilation debug  quot true quot  targetFramework  quot 4 5 quot  gt     lt assemblies gt            lt add assembly  quot System Runtime  Version 4 0 0 0  Culture neutral  PublicKeyToken b03f5f7f11d50a3a quot    gt        lt  assemblies gt   lt  compilation gt

User · Answer

I had this problem in some solutions on VS 2015  not MVC though   and even in the same solution on one workstation but not on another  The errors started appeared after changing  NET version to 4 6 and referencing PCL   The solution is simple  Close the solution and delete the hidden  vs folder in the same folder as the solution   Adding the missing references as suggested in other answers also solves the problem  but the error remains solved even after you remove the references again   As for TeamCity  I cannot say since my configuration never had a problem  But make sure that you reset the working catalog as a part of your debugging effort

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I had this problem in a solution with a Web API project and several library projects  One of the library projects was borking on build  with errors that said the Unity attributes weren t  valid  attributes  and then one error said I needed to reference System Runtime   After much searching  reinstalling the 4 5 2 Developer Pack  and nothing working  I figured maybe it was just a version mismatch  So I looked at the properties of every project  and one of the very base libraries was targeting 4 5 while every other one was targeting 4 5 2  I changed that one to also target 4 5 2 and the errors went away

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For me helped only this code line  Assembly Load  quot System Runtime  Version 4 0 0 0  Culture neutral  PublicKeyToken b03f5f7f11d50a3a quot

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On our Tfs 2013 build server I had the same error  in a test project  with the main web project running on  Net 4 5 1   I installed a nuGet package of System Runtime and added the reference from packages System Runtime 4 3 0 ref net462 System Runtime dll  That solved it for me

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I was also facing this problem trying to run an ASP  NET MVC project after a minor update to our codebase  even though it compiled without errors   Compiler Error Message  CS0012  The type  System Object  is defined in an assembly that is not referenced  You must add a reference to assembly  System Runtime  Version 4 0 0 0  Culture neutral  PublicKeyToken b03f5f7f11d50a3a    Our project had never run into this problem  so I was skeptical about changing configuration files before finding out the root cause  From the error logs I was able to locate this detailed compiler output which pointed out to what was really happening   warning CS1685  The predefined type  System Runtime CompilerServices ExtensionAttribute  is defined in multiple assemblies in the global alias  using definition from  c  Windows Microsoft NET Framework64 v4 0 30319 mscorlib dll  c  Users Admin Software Development source-control Binaries Publish WebApp Views Account Index cshtml 35 20   error CS0012  The type  System Object  is defined in an assembly that is not referenced  You must add a reference to assembly  System Runtime  Version 4 0 0 0  Culture neutral  PublicKeyToken b03f5f7f11d50a3a   c  Windows Microsoft NET Framework64 v4 0 30319 Temporary ASP NET Files meseems webapp 68e2ea0f 8c5ee951 assembly dl3 52ad4dac 84698469 3bb3d401 System Collections Immutable DLL   Location of symbol related to previous error   Apparently a new package added to our project was referencing an older version of the  NET Framework  causing the  quot definition in multiple assemblies quot  issue  CS1685   which led to the razor view compiler error at runtime  I removed the incompatible package  System Collections Immutable dll  and the problem stopped occurring  However  if the package cannot be removed in your project you will need to try Baahubali s answer

User · Answer

i added System Runtime dll to bin project and it worked

User · Answer

Adding a reference to this System Runtime dll assembly fixed the issue   C  Program Files  x86  Reference Assemblies Microsoft Framework  NETFramework v4 5 1 Facades System Runtime dll   Though that file in that explicit path doesn t exist on the build server   I will post back with more information once I ve found some documentation on PCL and these Facades   Update  Yeah pretty much nothing on facade assemblies on the whole internet   Google    Facades OR Facade  Portable Library site microsoft com

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It s an old issue but I faced it today in order to fix a build pipeline on our continuous integration server  Adding  lt Reference Include  quot System Runtime quot    gt   to my  csproj file solved the problem for me  A bit of context  the interested project is a full  NET Framework 4 6 1 project  without build problem on the development machines  The problem appears only on the build server  which we can t control  may be due to a different SDK version or something similar  Adding the proposed  lt Reference solved the build error  at the price of a missing reference warning  yellow triangle on the added entry in the references tree  in Visual Studio

User · Answer

Removing the reference over the Nuget Package Manager and re-adding it solved the problem for me

User · Answer

I copy the file  C  Program Files  x86  Reference Assemblies Microsoft Framework NETFramework v4 5 1 Facades system runtime dll  to bin folder of production server  this solve the problem

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install https   www microsoft com en-us download details aspx id 49978  Microsoft  NET Framework 4 6 1 Developer Pack and add this line of code in Web config file    lt compilation debug  true  targetFramework  4 5  gt             lt assemblies gt               lt add assembly  System Runtime  Version 4 0 0 0  Culture neutral  PublicKeyToken b03f5f7f11d50a3a   gt             lt  assemblies gt           lt  compilation gt

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I needed to download and install the Windows 8 0  and not 8 1  SDK to make the error disappear on my TeamCity server   https   developer microsoft com en-us windows downloads windows-8-sdk

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PeterMajeed s comment in the accepted answer helped me out with a related problem  I am not using the portable library  but have the same build error on a fresh Windows Server 2012 install  where I m running TeamCity   Installing the Microsoft  NET Framework 4 5 1 Developer Pack took care of the issue  after having separately installed the MS Build Tools

[c#] Build error: You must add a reference to System.Runtime

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