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Try add netstandard reference in web.config like this:

<system.web>
<compilation debug="true" targetFramework="4.7.1">
<assemblies>
<add assembly="netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51"/>
</assemblies>
</compilation>
<httpRuntime targetFramework="4.7.1"/>