Why am I getting 'Unable to find package Microsoft.AspNetCore.App.Ref.' error?

Richard Wheeler 1

I am running Visual Studio 2019 and trying to develop a .NET Core 3,1 ASP MVC application. I was working just fine yesterday but this morning I opened my project and began getting 'Unable to find package Microsoft.AspNetCore.App.Ref.' error and Unable to find package Microsoft.NETCore.App.Host.win-x64 errors.

My project is file is as follows:

<PropertyGroup>
<TargetFramework>netcoreapp3.1</TargetFramework>
</PropertyGroup>

</Project>

What happened? How did I lose these packages and how can I get them back?

Zhi Lv - MSFT 32,846 Reputation points Microsoft Vendor

2020-12-10T02:57:42.223+00:00
Hi @Richard Wheeler ,

Which version of these packages (Microsoft.AspNetCore.App.Ref and Microsoft.NETCore.App.Host.win-x64) are you using? Perhaps the issue is related that the .Net Core or package update, it's cause they don't match. Try to set the RuntimeFrameworkVersion version as below, and change the "Microsoft.AspNetCore.App.Ref" and "Microsoft.NETCore.App.Host.win-x64" package version to 3.1 version:

<PropertyGroup> <TargetFramework>netcoreapp3.1</TargetFramework> <RuntimeFrameworkVersion>3.1.0</RuntimeFrameworkVersion> </PropertyGroup>

Besides, you could also try to re-install the 3.1 version packages("Microsoft.AspNetCore.App.Ref" and "Microsoft.NETCore.App.Host.win-x64")

1 answer

Marcell Nagy 1 Reputation point

2020-12-11T09:38:19.49+00:00

Try to clean the solution, then rebuild. Looks like this was a caching problem.
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Why am I getting 'Unable to find package Microsoft.AspNetCore.App.Ref.' error?

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