The framework 'Microsoft.AspNetCore.App', version '5.0.0' was not found. when it is installed and inside $PATH

Question

I am working in Manjaro Linux.

I have a .NET Core project. The solution builds fine when I run dotnet build .

However, when I run:

dotnet-ef update --project Bejebeje.DataAccess --startup-project Bejebeje.Mvc 

I get the following strange error:

Build started... Build succeeded. It was not possible to find any compatible framework version The framework 'Microsoft.AspNetCore.App', version '5.0.0' was not found.   - No frameworks were found.  You can resolve the problem by installing the specified framework and/or SDK.  The specified framework can be found at:  - https://aka.ms/dotnet-core-applaunch?framework=Microsoft.AspNetCore.App&framework_version=5.0.0&arch=x64&rid=manjaro-x64 

It is strange because I already have the SDKs and runtimes for .NET 5.0 installed.

bejebeje|feature/upgrade-to-net-5 ⇒ dotnet --list-sdks 3.1.108 [/usr/share/dotnet/sdk] 5.0.103 [/usr/share/dotnet/sdk] bejebeje|feature/upgrade-to-net-5 ⇒ dotnet --list-runtimes Microsoft.NETCore.App 3.1.8 [/usr/share/dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 5.0.3 [/usr/share/dotnet/shared/Microsoft.NETCore.App] bejebeje|feature/upgrade-to-net-5 ⇒ 

Why is this happening? and what can I do to solve the problem?

Answer 1

I had the same problem. You need to have an ASP.NET runtime.

It's a bit confusing and easily overlooked, but it says you need an Microsoft.AspNetCore.App runtime, and your dotnet --list-runtimes only lists Microsoft.NETCore.Apps.

The ArchWiki mentions:

This is caused because the runtime is shipped as a separate package in Arch. You just need to make sure you have the aspnet-runtime package installed as well.

To install the .NET 5 runtime:

sudo pacman -Sy aspnet-runtime 

or if you need the 3.1 version:

sudo pacman -Sy aspnet-runtime-3.1 

Now there's an ASP runtime available:

$ dotnet --list-runtimes Microsoft.AspNetCore.App 5.0.4 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]  # <<< Microsoft.NETCore.App 5.0.4 [/usr/share/dotnet/shared/Microsoft.NETCore.App]