我是C＃和.net核心的新手我尝试使用dotnet / cli安装软件包 dotnet add package ... 但我有以下错误

info :   NotFound https://api.nuget.org/v3-flatcontainer/.../index.json 733m
s
error: Unable to resolve '...' for '.NETCoreApp,Version=v1.0.4'.
error: Package '...' is incompatible with 'all' frameworks in project 'C:\Us
ers\Mario\Documents\core_app\vega\Vega.csproj'.

在launch.json中有

"program": "${workspaceRoot}/bin/Debug/netcoreapp1.0.4/Vega.dll",

这是来自.csproj的片段

<PropertyGroup>
    <TargetFramework>netcoreapp1.0.4</TargetFramework>
    <TypeScriptCompileBlocked>true</TypeScriptCompileBlocked>
    <IsPackable>false</IsPackable>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore" Version="1.1.0" />
    <PackageReference Include="Microsoft.AspNetCore.Mvc" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.SpaServices" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.StaticFiles" Version="1.1.0" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="1.1.2" />
    <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="1.1.0" />
  </ItemGroup>

我应该安装最新版本的.net核心？

c# .net .net-core