@BrendanRice

This was in csc.exe.config:

<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="System.Numerics.Vectors" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-4.1.3.0" newVersion="4.1.3.0" />
      </dependentAssembly>
    </assemblyBinding>

I read in another forum that I should add this to msbuild.exe.config: Some reason the forum isn't showing the code here...

That didn't help.

I tried to post the full stack trace it was too long. here's a link to it: https://www.dropbox.com/s/g0elcir5n0sjubg/modelsbuilder-error-stack-trace.txt?dl=0

You'll need to change the binding redirect to match the version of the dll you've referenced.

Anywhere in the .config file that references 4.1.3.0 will need changed to 4.5.0 (possibly 4.5.0.0).

Also important to check the public key of the dll matches the PublicKeyToekn in the .config reference.

Here is how:

https://port135.com/public-key-token-assembly-dll-file/

Once you've fixed the references it should* work.

Let us know how it goes.

FYI...the public key token was the same for 4.5 as it was for 4.1.3

The reference I updated in csc.exe.config get's changed back to 4.1.3 every time I build my project.

I read in another forum to add this to msbuild.exe.config:

<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
    <dependentAssembly>
        <assemblyIdentity name="System.Numerics.Vectors" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-4.1.3.0" newVersion="4.5.0.0" />
    </dependentAssembly>
</assemblyBinding>

That didn't help either.

Try move the assembly binding to the web.config

That didn't work either.

Here's what I put in web.config:

<dependentAssembly>
    <assemblyIdentity name="System.Numerics.Vectors" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-4.1.3.0" newVersion="4.5.0.0" />
  </dependentAssembly>

Updated stack trace in case it helps.

https://www.dropbox.com/s/irfsrgj4mkseqnr/modelsbuilder-error.txt?dl=0

"The located assembly's manifest definition does not match the assembly reference."

^ this normally suggests that what is in the config file doesn't match what is in the bin folder.

Usually when something like this happens it's to do with incorrect version numbers or the public key.

Sorry I can't be any more help.

For that you can also check the reference in the project file (open the .csproj in a txt editor).

Look for something like:

<Reference Include="System.Numerics.Vectors, Version=4.1.4.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
      <HintPath>..\..\packages\System.Numerics.Vectors.4.5.0\lib\net46\System.Numerics.Vectors.dll</HintPath>
</Reference>

Maybe compare it to what is in the Nuget folder and the config file.