Make sure you add the DotNetCliToolReference to your WebApi project. I assume the VS2017 csproj file.
<ItemGroup>
<DotNetCliToolReference Include="Microsoft.EntityFrameworkCore.Tools.DotNet" Version="1.0.0" />
<DotNetCliToolReference Include="BundlerMinifier.Core" Version="2.2.281" />
</ItemGroup>
The second entry in the code is above.
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