I was playing around with Visual Studio 2019 and the open source ASP.NET Core blog engine Miniblog.Core. I cloned it to my local, opened it in Visual Studio 2019 and tried to build the solution. I immediately ran into the error below:
Error CS8630 Invalid 'nullable' value: 'Enable' for C# 7.3. Please use language version '8.0' or greater.
So, I looked up the error message and every Stack Overflow page I ended up on, says that I have to set the Language Version in Visual Studio. Okay, so how do I do that? I eventually found this answer, which gives you the steps to get to the Advanced Build Settings dialog box for the project.
read more : invalid nullable value enable for c# 7.3
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