Cannot load file or assembly 'System.Runtime' - asp.net

Question

I have an Asp.Net 4.7 WebForms legacy application written in vb.net. To add Azure B2C authentication, I add OWIN middleware NuGet packages like this:
Install-Package Microsoft.Owin.Security.OpenIdConnect
Install-Package Microsoft.Owin.Security.Cookies
Install-Package Microsoft.Owin.Host.SystemWeb
based on this tutorial: https://learn.microsoft.com/en-us/azure/active-directory/develop/tutorial-v2-asp-webapp
When I try to run the application, I get this error:
Could not load file or assembly 'System.Runtime, Version=4.0.0.0,
Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its
dependencies. The system cannot find the file specified.
Here is the log:
Assembly manager loaded from: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\clr.dll
Running under executable C:\Program Files\IIS Express\iisexpress.exe
--- A detailed error log follows.
=== Pre-bind state information ===
LOG: DisplayName = System.Runtime, Version=4.0.0.0, Culture=neutral, PublicKeyToken=...
(Fully-specified)
LOG: Appbase = file:///C:/Git Repos/InfoWeb/
LOG: Initial PrivatePath = C:\Git Repos\InfoWeb\bin
Calling assembly : System.Net.Http.Primitives, Version=4.2.29.0, Culture=neutral, PublicKeyToken=....
===
LOG: This bind starts in default load context.
LOG: Using application configuration file: C:\Git Repos\InfoWeb\web.config
LOG: Using host configuration file: C:\Users\dreznik\OneDrive - MyCompany\Documents\IISExpress\config\aspnet.config
LOG: Using machine configuration file from C:\Windows\Microsoft.NET\Framework64\v4.0.30319\config\machine.config.
LOG: Redirect found in application configuration file: 4.0.0.0 redirected to 4.1.1.0.
LOG: Post-policy reference: System.Runtime, Version=4.1.1.0, Culture=neutral, PublicKeyToken=...
LOG: Attempting download of new URL file:///C:/Windows/Microsoft.NET/Framework64/v4.0.30319/Temporary ASP.NET Files/vs/17153f21/a2ffde83/System.Runtime.DLL.
LOG: Attempting download of new URL file:///C:/Windows/Microsoft.NET/Framework64/v4.0.30319/Temporary ASP.NET Files/vs/17153f21/a2ffde83/System.Runtime/System.Runtime.DLL.
LOG: Attempting download of new URL file:///C:/Git Repos/InfoWeb/bin/System.Runtime.DLL.
LOG: Attempting download of new URL file:///C:/Git Repos/InfoWeb/bin/System.Runtime/System.Runtime.DLL.
LOG: Attempting download of new URL file:///C:/Windows/Microsoft.NET/Framework64/v4.0.30319/Temporary ASP.NET Files/vs/17153f21/a2ffde83/System.Runtime.EXE.
LOG: Attempting download of new URL file:///C:/Windows/Microsoft.NET/Framework64/v4.0.30319/Temporary ASP.NET Files/vs/17153f21/a2ffde83/System.Runtime/System.Runtime.EXE.
LOG: Attempting download of new URL file:///C:/Git Repos/InfoWeb/bin/System.Runtime.EXE.
LOG: Attempting download of new URL file:///C:/Git Repos/InfoWeb/bin/System.Runtime/System.Runtime.EXE.
How can this be resolved? I have already tried to delete temporary Asp.Net files.

Answer 1

You must check that assemblyBinding subsection inside runtime section of web.config file have correct value that define System.Runtime.
It must be something like this
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="System.Runtime" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
<bindingRedirect oldVersion="4.0.0.0-4.0.0.0" newVersion="6.0.0.0" />
</dependentAssembly>
</assemblyBinding>
</runtime