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Editorial Team
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Asked: 2026-05-24T11:03:02+00:00

I don’t know what’s wrong with my machine, but it’s a while that I’m

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I don’t know what’s wrong with my machine, but it’s a while that I’m getting the following strange error from ASP.NET (for all my applications).

Compilation Error

Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately. 

Compiler Error Message: The compiler failed with error code -1073741502.


Show Detailed Compiler Output:


C:\Windows\SysWOW64\inetsrv> "C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe" /t:library /utf8output /R:"C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\75855fbd\1e953b27\assembly\dl3\2689d6b5\f0791420_961fcc01\wnvhtmlconvert.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System\v4.0_4.0.0.0__b77a5c561934e089\System.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Drawing\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Drawing.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_32\System.Web\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Web.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.Entity\v4.0_4.0.0.0__b77a5c561934e089\System.Web.Entity.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.ServiceModel.Web\v4.0_4.0.0.0__31bf3856ad364e35\System.ServiceModel.Web.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.IdentityModel\v4.0_4.0.0.0__b77a5c561934e089\System.IdentityModel.dll" /R:"C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\75855fbd\1e953b27\assembly\dl3\d08c81cd\4d77c01f_961fcc01\AjaxControlToolkit.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.ServiceModel.Activation\v4.0_4.0.0.0__31bf3856ad364e35\System.ServiceModel.Activation.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.ApplicationServices\v4.0_4.0.0.0__31bf3856ad364e35\System.Web.ApplicationServices.dll" ......AND SO ON.....

Facts:

  1. Killing worker process fixes the problem temporarily
  2. I even reinstalled my .NET framework! It didn’t work.
  3. Restarting IIS doesn’t help

What can cause this problem?

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1 Answer

  1. Editorial Team

    OK, after days struggling with this issue, I finally fixed it.

    • Not by clearing ASP.NET temp
    • Not by reinstalling the .NET framework!

    Simple!

    • I changed the application pool identity from “Local system” to “ApplicationPoolIdentity”

    Apparently there was a permission error with my local system that the C# compiler (csc.exe) could not access some resources and source codes.

    In order to change your AppPool identity follow steps given here: http://learn.iis.net/page.aspx/624/application-pool-identities/

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