Nrthugu

I am trying to simply follow this guide to set up a simple app with authentication.

When I try entering this command

dotnet aspnet-codegenerator identity -dc WebApp1.Data.ApplicationDbContext --files "Account.Register;Account.Login;Account.Logout"

To scaffold a few pages, I get this error

It was not possible to find any compatible framework version
The specified framework 'Microsoft.NETCore.App', version '2.1.6' was not found.
- Check application dependencies and target a framework version installed at:
C:Program Filesdotnet
- Installing .NET Core prerequisites might help resolve this problem:
http://go.microsoft.com/fwlink/?LinkID=798306&clcid=0x409
- The .NET Core framework and SDK can be installed from:
https://aka.ms/dotnet-download
- The following versions are installed:
1.0.1 at [C:Program FilesdotnetsharedMicrosoft.NETCore.App]
1.0.4 at [C:Program FilesdotnetsharedMicrosoft.NETCore.App]
1.0.5 at [C:Program FilesdotnetsharedMicrosoft.NETCore.App]
1.0.13 at [C:Program FilesdotnetsharedMicrosoft.NETCore.App]
1.1.0 at [C:Program FilesdotnetsharedMicrosoft.NETCore.App]
1.1.1 at [C:Program FilesdotnetsharedMicrosoft.NETCore.App]
1.1.2 at [C:Program FilesdotnetsharedMicrosoft.NETCore.App]
1.1.10 at [C:Program FilesdotnetsharedMicrosoft.NETCore.App]
2.0.6 at [C:Program FilesdotnetsharedMicrosoft.NETCore.App]
2.0.9 at [C:Program FilesdotnetsharedMicrosoft.NETCore.App]
2.1.0-preview1-26216-03 at [C:Program FilesdotnetsharedMicrosoft.NETCore.App]
2.1.4 at [C:Program FilesdotnetsharedMicrosoft.NETCore.App]
2.1.5 at [C:Program FilesdotnetsharedMicrosoft.NETCore.App]

I added the nuget package Microsoft.EntityFrameworkCore.Design as suggested here but with no effect.

I followed the link to downlowd '.NET core prerequisites`, but this just has the .net sdk...

I have not specified any 2.1.6 anywhere in my project - where would that even be? I also searched the internet for .net core framework 2.1.6 but that doesn't exist..

my csproj file looks like this

<PropertyGroup>

  <TargetFramework>netcoreapp2.1</TargetFramework>

  <UserSecretsId>aspnet-SocFace-D83867AE-294A-4562-B8D7-10674D5B4C05</UserSecretsId>

</PropertyGroup>



<ItemGroup>

  <None Update="app.db" CopyToOutputDirectory="PreserveNewest" />

</ItemGroup>



<ItemGroup>

  <PackageReference Include="Microsoft.AspNetCore.App" />

  <PackageReference Include="Microsoft.AspNetCore.Razor.Design" Version="2.1.2" PrivateAssets="All" />

  <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="2.1.4" />

  <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="2.1.5" PrivateAssets="All" />

</ItemGroup>

I tried including a version for Microsoft.AspNetCore.App like this:

<PackageReference Include="Microsoft.AspNetCore.App" Version="2.1.5"/>

but it made no difference

Here's a version of your Error Message to make clear what's happening:

The specified framework 'Microsoft.NETCore.App', version '2.1.6' was not found.

The following versions are installed:

1.0.1 at [C:Program FilesdotnetsharedMicrosoft.NETCore.App]

...
2.1.5 at [C:Program FilesdotnetsharedMicrosoft.NETCore.App]

Apparently you've specified the target framework to be version 2.1.6, while the highest version you have installed is 2.1.5. Install version 2.1.6 (or re-target to 2.1.5) and you should be good to go.

EDIT:

According to the Microsoft.NETCore.App page on NuGet version 2.1.6 is a prerelease version. Same for Microsoft.AspNetCore.App. Explicitly setting the versions for your references should solve this issue.