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More than likely your file /etc/nginx/sites-enabled/default on line 21 as noted in the error has that line uncommented causing nginx to attempt to read/load - unknown directive “http://wiki.nginx.org/QuickStart”
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<br>Check the file and comment out or delete that line. If you like, you can paste the contents of /etc/nginx/sites-enabled/default here and we can confirm.
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