I defined a layout with a variable image using your logo and it works perfectly fine. So I think, the problem is with your path that somehow is not found or not interpreted correctly. Could you try if you can get it working with a more common path, like a local path on your PC?
Senior Software Engineer
"A reasonable man adapts himself to the world. The unreasonable man persists in trying to adapt the world to himself. All progress, therefore, depends on the unreasonable man." (Bernard Shaw)