MSB3644: The reference assemblies for framework ".NETFramework,Version=v5.0" were not found

Environment : Windows 10, laptop, Visual studio community 2017
dotnet version : 8.0.100-preview.1.23115.2(latest)

I downloaded this library and tried to compile as dll. because my plugin need this code.

but, it couldn't be compiled.

this is the error message :

MSB3644: The reference assemblies for framework ".NETFramework,Version=v5.0" were not found

so, I tried to install .net SDK 5.0, but found it is not supported version and it is for visual studio 2019.(I'm using visual studio 2017.)

I don't remember well, but after I install newer version of visual studio,it is solved, maybe.

but I'm not sure.