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For all images in https://commons.wikimedia.org/wiki/Category:Cultural_heritage_monuments_in_Sakhnovschyna_Raion it is impossible to create thumbnails. 

Trying to get a specific thumbnail, i.e. https://upload.wikimedia.org/wikipedia/commons/thumb/7/70/%D0%9F%D0%BE%D1%85%D0%BE%D0%B2%D0%B0%D0%BD%D0%BD%D1%8F_%D0%BA%D0%BE%D0%B7%D0%B0%D0%BA%D0%B0_%D0%93%D1%80%D0%B8%D0%B3%D0%BE%D1%80%D1%96%D1%8F_%D0%A8%D1%83%D0%BB%D1%8C%D0%B3%D0%B8_%D0%B1%D1%96%D0%BB%D1%8F_%D1%81%D0%B5%D0%BB%D0%B0_%D0%90%D0%BD%D0%B4%D1%80%D1%96%D1%97%D0%B2%D0%BA%D0%B0_%D0%A1%D0%B0%D1%85%D0%BD%D0%BE%D0%B2%D1%89%D0%B8%D0%BD%D1%81%D1%8C%D0%BA%D0%BE%D0%B3%D0%BE_%D1%80%D0%B0%D0%B9%D0%BE%D0%BD%D1%83_%D0%A5%D0%B0%D1%80%D0%BA%D1%96%D0%B2%D1%81%D1%8C%D0%BA%D0%BE%D1%97_%D0%BE%D0%B1%D0%BB%D0%B0%D1%81%D1%82%D1%96_01.JPG/320px-%D0%9F%D0%BE%D1%85%D0%BE%D0%B2%D0%B0%D0%BD%D0%BD%D1%8F_%D0%BA%D0%BE%D0%B7%D0%B0%D0%BA%D0%B0_%D0%93%D1%80%D0%B8%D0%B3%D0%BE%D1%80%D1%96%D1%8F_%D0%A8%D1%83%D0%BB%D1%8C%D0%B3%D0%B8_%D0%B1%D1%96%D0%BB%D1%8F_%D1%81%D0%B5%D0%BB%D0%B0_%D0%90%D0%BD%D0%B4%D1%80%D1%96%D1%97%D0%B2%D0%BA%D0%B0_%D0%A1%D0%B0%D1%85%D0%BD%D0%BE%D0%B2%D1%89%D0%B8%D0%BD%D1%81%D1%8C%D0%BA%D0%BE%D0%B3%D0%BE_%D1%80%D0%B0%D0%B9%D0%BE%D0%BD%D1%83_%D0%A5%D0%B0%D1%80%D0%BA%D1%96%D0%B2%D1%81%D1%8C%D0%BA%D0%BE%D1%97_%D0%BE%D0%B1%D0%BB%D0%B0%D1%81%D1%82%D1%96_01.JPG

I get: "Error generating thumbnail

Error creating thumbnail: Unable to save thumbnail to destination"

Purging does not help.

*** This bug has been marked as a duplicate of bug 39697 ***