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Fix nginx error on wordpress website (probably from plugin)

Status: Closed
Prize: $25
Entries Received: 12
Winner: BinhSEO

Winner

Contest Brief

There is an nginx error on this website:
http://www.oddnysatelier.no/zen/
(look in the code, I have tried to hide it temporarily by using CSS)

If I filter out the wordpress wp_head tag in the wordpress header file, the error goes away. I can't narrow it down, so it must probably be in another file. I've seen somewhere that it might be caused by a WP-addon trying to call a file from an external website that has been removed from the internet, but I'm not sure.
I believe it might be caused by the RoyalSlider addon, but I'm not sure. You cannot take a solution which will make either of these apps/addons not work:
1) Wordpress
2) RoyalSlider
3) Zenphoto

Please, no sloppy solutions. I want you to find the source of the problem, fix it, test that things should be working and give me feedback on exactly what you have changed in case it will cause problems later.