Cannot make image overlay

[howhjohn]

[leaflet-map address="Kowloon, Hong Kong" zoom=14 height=800 doubleClickZoom=true scrollwheel]

[leaflet-image-overlay src="XXX" ]

When I follow the steps of making an image overlay on my map, as I type [leaflet-image-overlay src="XXX" ], I found my map disappeared, and was replaced by the map from the example code. How can I fix it? Thanks.

[bozdoz]

Is the example page working?