[NTG-context] Minimals tree on Wiki?

Searching information in the Wiki on the minimals tree the following page: http://wiki.contextgarden.net/ConTeXt_Minimals/Tree did not render as expected, the thumnails are not showing; example: Error creating thumbnail: convert: unable to open image `/var/www/contextgarden.net/contextwiki/images/4/46/P1030314.jpg': No such file or directory. convert: missing an image filename `/var/www/contextgarden.net/contextwiki/images/thumb/4/46/P1030314.jpg/300px-P1030314.jpg'. Is there something amiss here? Hans van der Meer