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I have a .NET 4.8 (migrated from .NET 4.5.2) ASP.NET Web API that I have deployed to a dev server and it is working fine.

I take the same code and deploy it to a qa server, and I am getting the following error when I call it:

Could not load file or assembly 'Microsoft.Web.Infrastructure, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

Both servers have .NET 4.8 installed.

The web.config has the following redirection:

<dependentAssembly>
    <assemblyIdentity name="Microsoft.Web.Infrastructure" publicKeyToken="31bf3856ad364e35" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-2.0.0.0" newVersion="2.0.0.0" />
</dependentAssembly>

I look in the bin folder and Microsoft.Web.Infrastructure.dll exists, and when I check its properties, the version is v2.0.34876.0

I don't see why it is looking for v1 instead of v2, and why it would work on one server but not another.

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    Have you tried setting newVersion to "2.0.34876.0" instead of "2.0.0.0"? Commented Mar 20 at 18:42
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    It looks a bit like this question: stackoverflow.com/questions/13149851/… If you check packages.config, does that still contain a reference to 1.0.0.0 ? If so, follow the steps of Riaan and let us know the results. Commented Mar 20 at 19:12
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    Does this work: oldVersion="0.0.0.0-2.0.34876.0" newVersion="2.0.34876.0" assuming you are not running in debug mode/or release to match the folders IN the bin folder Commented Mar 20 at 20:29
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    Try this cmd in the Package Manager Console: Get-Project –All | Add-BindingRedirect, should straighten everything out. Test local, then make sure updated web.config get's published on the server. Commented Mar 20 at 20:37
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    This MIGHT be some dependency code FOR that newer version also in play here i.e. issue with that or it not being there etc. Commented Mar 21 at 1:24
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