This is a bug in the plugin, it assumes that the element you pass to the plugin has the correct URL as the source.
This may be a reasonable assumption, but it does not cope with the situation where the background image in the source element is missing, when the browser says "none" .
You should probably report this if you care about the plugin because it is an unwanted and useless download on the server.
In any case, you should also use the plugin correctly, what you want:
source: '#page'
However, the original image must be placed by you, not onlinedesign4uu.co.uk , because the cross-contour image will not work.
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