Rider: Error on [AutoConstructor] from nuget says "is not an attribute", classes with it give errors of having no constructors defined.

I'm working on a big solution with 15+ projects, using AutoConstructor NuGet. It compiles and runs with no problems, Visual Studio shows no errors here, while Rider finds 150+ errors in the solution, context menu doesn't give an option to not treat it as a problem, and I have a feeling I shouldn't really make this error itself disappear, but the fact it's doing it on a correct code is really frustrating as other errors through the solution become really hard to find.

I am kinda a newbie, so probably missing some really easy solution, google only gave me this solution, however, I am not sure what project exactly should I add it to and what is that source generator file as we don't have such, it comes from a NuGet. We do install the nugets onto the projects, however, using a different file to define all of their versions.

Sadly I can't provide any code or solutions with the problem, but it would be easily reproduced by installing AutoConstructor nuget and trying to use it for a class.

Thank you for any help!