Add-Migration failed in vs 2017

[masterchen]

Thanks for this project.
When i launch this project in vs 2017 ,the browser opened one url but then closed automatically. i found there is a warning :
The specified framework 'Microsoft.NETCore.App', version '1.1.1' was not found.
EnvironmentWatch> - Check application dependencies and target a framework version installed at:
EnvironmentWatch> C:\Program Files\dotnet
EnvironmentWatch> - Installing .NET Core prerequisites might help resolve this problem:
EnvironmentWatch> http://go.microsoft.com/fwlink/?LinkID=798306&clcid=0x409
EnvironmentWatch> - The .NET Core framework and SDK can be installed from:
EnvironmentWatch> https://aka.ms/dotnet-download
EnvironmentWatch> - The following versions are installed:
EnvironmentWatch> 2.0.6 at [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
EnvironmentWatch> 2.0.7 at [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
EnvironmentWatch> 2.1.1 at [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
EnvironmentWatch> It was not possible to find any compatible framework version

also, i try to migrate database , but come to following error:
Add-Migration : 使用“1”个参数调用“AddFromFile”时发生异常:““basePath”不能为空字符串("")或以 null 字符开头。
参数名: basePath”
所在位置 行:1 字符: 1

• Add-Migration FirstMigration

•   + CategoryInfo          : NotSpecified: (:) [Add-Migration], MethodInvocationException
    + FullyQualifiedErrorId : ArgumentException,Add-Migration
  
  
  

I know this might cause by version.

so do you have plan to update you project to vs2017 ?