Cannot create netcoreapp1.x templates after installing 2.0 CLI

Installing the 2.0 CLI makes netcoreapp1.x templates inaccessible

Repro Install .NET Core SDK 1.0.4 dotnet new web --framework netcoreapp1.1. Works 😄

Install .NET Core SDK 2.0.0 dotnet new web --framework netcoreapp1.1.

Expected The template system sees that both a 1.0 and 2.0 SDK are installed and fallsback to the 1.0 SDK for frameworks the 2.0 SDK doesn’t include

Actual

Error: Invalid parameter(s):
--framework netcoreapp1.1
    'netcoreapp1.1' is not a valid value for --framework (Framework).

Workaround Before invoking dotnet new, create a global.json file and point dotnet to the old version.

{ "sdk": { "version": "1.0.4" }}

[AnupSingh2008]

In your system higher version of core is available. So to fix the issue type this command dotnet new mvc --language C# --auth None --framework netcoreapp2.1 and it will work.

Always version which is installed in your system.

[seancpeters]

This is actually by design. The dotnet CLI 2.x does not ship with the 1.x templates because the 2.x CLI does not carry the 1.0/1.1 runtimes. But you can install the 1.x templates on your 2.x CLI install. To install them, add this myget feed to your global NuGet.config: https://dotnet.myget.org/F/templating/api/v3/index.json, and then install the desired template packs using one or more of these commands:

dotnet new -i Microsoft.DotNet.Common.ProjectTemplates.1.x::1.0.0-*
dotnet new -i Microsoft.DotNet.Test.ProjectTemplates.1.x::1.0.0-*
dotnet new -i Microsoft.DotNet.Web.ProjectTemplates.1.x::1.0.0-*