1,745 questions
Parser Error Message when loading ASP .NET Web Application
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(243.2, 21%, 33%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMP%3C/text%3E%3C/svg%3E)
Matthew Paisley
0
Reputation points
I have a C# .NET Web Application the runs fine in Windows 2022 Debugger. When I deploy to IIS Manager and attempt to load the page I get:
Configuration Error
Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately.
Parser Error Message: The CodeDom provider type "Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" could not be located.
Source Error:
Line 25: <system.codedom>
Line 26: <compilers>
Line 27: <compiler language="c#;cs;csharp" extension=".cs" warningLevel="4" compilerOptions="/langversion:default /nowarn:1659;1699;1701;612;618" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
Line 28: <compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" warningLevel="4" compilerOptions="/langversion:default /nowarn:41008,40000,40008 /define:_MYTYPE=\"Web\" /optionInfer+" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
Line 29: </compilers>
Source File: C:\WebDemos\CodeHandBook.Sample.FileUpload\web.config Line: 27
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.9037.0
I have tried to load the package with the nuget package manager console, but tis doesn't help. Any ideas will be most appreciated.
Thanks,
Matt Paisley
Windows development Internet Information Services
Developer technologies ASP.NET Other
3,598 questions
{count} votes
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(6.4, 70%, 10%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EYD%3C/text%3E%3C/svg%3E)
Yurong Dai-MSFT 2,846 Reputation points Microsoft External Staff2023-12-19T05:58:35.3733333+00:00 Hi @Matthew Paisley,
Make sure the
Microsoft.CodeDom.Providers.DotNetCompilerPlatformNuGet package is installed in your project. You can do this by checking the project's references or using the package manager console:Install-Package Microsoft.CodeDom.Providers.DotNetCompilerPlatformThe error message mentions version 4.1.0.0, make sure the version specified in the
web.configfile matches the version of the installed NuGet package. After making sure the package is installed correctly, if that still doesn't work, try cleaning and rebuilding your solution. -
Lex Li (Microsoft) 6,037 Reputation points Microsoft Employee2023-12-19T06:42:36.1866667+00:00 What were the steps you followed to deploy to IIS? If you simply copied the source code over but didn't publish using the relevant tools (like this), then the folder does not contain a complete web app and errors are expected.
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Matthew Paisley 0 Reputation points
2023-12-19T15:26:49.8666667+00:00 Thanks for your reply.
After publishing to a folder, can I add a Virtual Directory from IIS Mgr to finish.
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Yurong Dai-MSFT 2,846 Reputation points Microsoft External Staff
2023-12-26T07:26:46.9733333+00:00 you can use a virtual directory in IIS to host a separate application or content within an existing website. This can be useful when you have multiple applications or content that you want to manage under a single website.
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