DLL with reference assemblies wrong

Hi, I built a DLL from VSCode and C# and I want to use it in a Unity Project 2018.3.14f1

In VSCode to build de DLL I use this command dotnet build

When I copy the DLL into my Unity project I have the following warning

Failed to update assembly ‘Assets/xxx.dll’: Assembly reference folder does not exist: ‘C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework**.NETCoreApp**\v3.0’.

The issue is I don’t have the .NETCoreApp in that path. The correct one should be:

‘C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.0’

I didn’t find the way to set it up correctly in the VSCode project

Any idea?
Thanks in advance

Same problem here ‘-’