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I experienced this when upgrading .NET Core 1.1 to 2.1.
I followed the instructions outlined here.
Try to remove <RuntimeFrameworkVersion>1.1.1</RuntimeFrameworkVersion> or <NetStandardImplicitPackageVersion> section in the .csproj.
<RuntimeFrameworkVersion>1.1.1</RuntimeFrameworkVersion>
<NetStandardImplicitPackageVersion>