The library 'hostpolicy.dll' required to execute the application

Question

After adding log4net, I end up with the following error message in publication via the dotnet command (IIS giving a 500 error).

A fatal error was encountered. The library 'hostpolicy.dll' required to execute the application was not found in 'MonPath'

Framework : .Net CoreApp 1.1

In Debug mode via VS2017, the application is running.

In my .csproj :

PackageReference Include="Microsoft.NETCore.DotNetHostPolicy" Version="1.1.2" PackageReference Include="Microsoft.AspNetCore" Version="1.1.2" TargetFramework netcoreapp1.1

I have found this solution for project.json but how to apply it to .csproj?

"compilationOptions": { "emitEntryPoint": true }

Answer 1

Just had a similar issue with unit tests unable to be discovered or executed in VS2015. And getting the same error as above if I run the command in a CMD Prompt.

Could not find a solution on the internet a spent a day to find that I needed to place the following in the project.json file

"runtimeOptions": {
  "framework": {
    "name": "Microsoft.NETCore.App",
    "version": "1.0.0"
  }
},

This results the {app}.runtimeconfig.json file to be created in the Debug directory of the build for the app.

This all came about because I installed DotNetCore 2 Preview.

Placing this here cause it was the most resent and second on the google search, hopefully people that need this will find.