The library hostpolicy.dll was not found

Question

I have a simple .NET Core project (console app) that I\'m trying to compile and run. dotnet build succeeds, but I get the following error when I do dotnet

Answer 1

I had this same problem with a .NET Core 3.0 WPF app, but I found that my app wouldn't run in Visual Studio 2019 either.

I discovered on the project properties page (right-click on project > Properties) that the Target framework was set to .NET Core 3.0.

I'd recently updated VS 2019 which had also installed .NET Core 3.1, so I switched to that in the dropdown, and it worked again.

(I also had to update my shortcut to point to the netcoreapp3.1 folder instead of the previous netcoreapp3.0 folder.)