System.IO.FileNotFoundException: Could not load file or assembly 'System.Runtime.CompilerServices.Unsafe, Version=6.0.0.0, Culture=neutral

Question

System.IO.FileNotFoundException: Could not load file or assembly &#x27;System.Runtime.CompilerServices.Unsafe, Version=6.0.0.0, Culture=neutral

Accepted Answer

Question: How do you solve the error in IIS that says:

Category: Microsoft.AspNetCore.Server.IIS.Core.IISHttpServer
EventId: 2

Connection ID "18302628899323904004", Request ID "(null)": An unhandled exception was thrown by the application.

Exception:
System.IO.FileNotFoundException:'>#f8cac6;">System.IO.FileNotFoundException: Could not load file or assembly 'System.Runtime.CompilerServices.Unsafe, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The system cannot find the file specified.
File name: 'System.Runtime.CompilerServices.Unsafe, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
at Microsoft.AspNetCore.HttpSys.Internal.RequestHeaders.PropertiesTryGetValue(String key, StringValues& value)
at Microsoft.AspNetCore.HttpSys.Internal.RequestHeaders.Microsoft.AspNetCore.Http.IHeaderDictionary.get_Item(String key)
at Microsoft.AspNetCore.Server.IIS.Core.IISHttpContext.CheckRequestCanHaveBody()
at Microsoft.AspNetCore.Server.IIS.Core.IISHttpContext.InitializeContext()
at Microsoft.AspNetCore.Server.IIS.Core.IISHttpContextOfT`1.ProcessRequestAsync()

Answer:

[Scenerial 1]: If you happened to have restored all the Nuget Packages in the Project.csproj manually, there is a chance that you defined or typed a wrong version of the Microsoft.Extentions.Configuration.Abstructions and Microsoft.Extensions.Configuration. If the package version is downgraded or is not in sync with the version of Microsoft.Extensions.Configuration this might create errors in IIS.

Ways to resolve the error.

1. Make sure that if you have more than one project in the Solution, only include the packages mentioned in the Answer Section in those project.

The Microsoft.Extensions.Configuration.Abstractions and Microsoft.Extensions.Configurations are needed in order for the project to get access to the appsettings.json file. If the versions are mismatched IIS Asp.Net Core Runtime might throw an error.

2. Consider the way you are deploying Compiled Production Ready files to IIS. If you are sorting the Files based on date and then only deploy files that have changed, the Microsoft.Extensions.Configuration.Abstructions and Microsoft.Extensions.Configuration might not be reflecting the change in versions. In order to weed out this possibility, deploy all the files needed for an app to run in IIS while the IIS Server is stopped.

3. Keep your eye on the Windows Event View and sort the Logs based on Errors. This will show you what errors IIS and Asp.Net Core Runtime are throwing.

[Edited]

The application is throwing a "System.IO.FileNotFoundException" exception indicating that it could not load the "System.Runtime.CompilerServices.Unsafe" assembly with version 6.0.0.0, neutral culture and public key token 'b03f5f7f11d50a3a'.

This may indicate that the assembly is missing or not installed on the system where the application is running, or there may be a version mismatch between the required version and the available version.

To resolve this issue, ensure that the required assembly is installed and referenced in the project. Additionally, check if there are any binding redirects specified in the project's configuration files that may be causing the version mismatch issue.

[Scenerial 2]: When you publish the Appliction, the old files are not deleted. Ensure that old files in the published folder are deleted before republishing the new
application files.

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