Feature 'async main' is not available in C# 7.0. Please use language version 7.1 or greater. [C:\temp\aspnetcore-angular-universal-master\Asp2017.csproj]

[woxingren]

I just download the latest version and try to run it, then get this compiler error.
This problem is from asp.net.
one workaround is found here: dotnet/aspnetcore#2751

Basically, the workaround is to put <LangVersion>latest</LangVersion> inside the main <PropertyGroup> at the top, then no error anymore.

I post here to help anyone who have the same problem.