Reflection a DLL that make another reflection

I'm working with reflection and my target DLL does reflection too. My doubt is when my target DLL execute this line of code

        string cachePath = System.Reflection.Assembly.GetExecutingAssembly().Location;
        cachePath = Path.GetDirectoryName(cachePath);

Whats the path result of GetExecutingAssembly method? 'because it is throwing "path is not legal form " exception.

I tried to use

        System.Diagnostics.Debug.WriteLine(cachePath);

But it didn't show the message.

Thanks in advance.