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System.IO.FileLoadException: Could not load file or assembly 'Google.Api.Gax.Grpc, Version=2.1.0.0'

See original GitHub issue

System.IO.FileLoadException: Could not load file or assembly 'Google.Api.Gax.Grpc, Version=2.1.0.0, Culture=neutral, PublicKeyToken=3ec5ea7f18953e47' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference.

.Net 4.6.1 Error occurs when trying to execute Google.Cloud.PubSub.V1 (1.0.0-beta13) code.

We do have binding redirects (that have correct versions):

      <dependentAssembly>
        <assemblyIdentity name="Google.Api.Gax" publicKeyToken="3ec5ea7f18953e47" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-2.2.1.0" newVersion="2.2.1.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="Google.Api.Gax.Grpc" publicKeyToken="3ec5ea7f18953e47" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-2.2.1.0" newVersion="2.2.1.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="Google.Api.Gax.Rest" publicKeyToken="3ec5ea7f18953e47" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-2.2.1.0" newVersion="2.2.1.0" />
      </dependentAssembly>