Calling Enqueue<T> throws exception

I’ve got a simple console app as a Proof of Concept.
In my main method I have a line:

BackgroundJob.Enqueue<Test>((t) => Console.WriteLine(t.Sum(3,4)));

My Test class looks like this:

public class Test
    public Test(){ }

    public int Sum(int a, int b)
        return a + b;

When i F5 my program I get an exception on the line with Enqueue:
"An unhandled exception of type ‘System.InvalidOperationException’ occurred in System.Core.dll
Additional information: variable ‘t’ of type ‘HangfireTest.Test’ referenced from scope ‘’, but it is not defined"

What am I doing wrong here?