ASP.NET CodeDom provider could not be located error

c# asp.net codedom
Adam Sancho picture Adam Sancho · Jul 8, 2019 · Viewed 9.1k times · Source

I'm facing an ASP.NET error while deploying on a server:

The CodeDom provider type "Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" could not be located.

This error only takes place on a specific server, when executing it locally or on another server it works just fine.

packages.config CodeDom line

  <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="2.0.0" targetFramework="net461" />

Web.Config CodeDom line

  <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:1659;1699;1701"/>

Answer

Sergei Russkikh picture Sergei Russkikh · Nov 12, 2019

Most likely the project has the Roslyn reference and the IIS server you're deploying on doesn't support it. Either upgrade the server or remove the Roslyn compiler from your project. Removing Roslyn is quite safe and shouldn't affect anything.

To remove Roslyn from your project remove the following Nuget Packages by running the commands:

PM> Uninstall-package Microsoft.CodeDom.Providers.DotNetCompilerPlatform
PM> Uninstall-package Microsoft.Net.Compilers

or through Nuget GUI (right-click on the project -> Manage Nuget packages)

If this doesn't help go to your Web.config and remove the following configuration and restart IIS:

<system.codedom>
<compilers>
  <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:6 /nowarn:1659;1699;1701" />
  <compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:14 /nowarn:41008 /define:_MYTYPE=\&quot;Web\&quot; /optionInfer+" />
</compilers>

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