Nginx Error File - Unable to guess which file it calls

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http://www.linuxquestions.org – A line in, sites-available/site.conf Code: error_page 404 404.html I have also linked sites-available to sites-enabled. Site is working without any problem But if i type some wrong url, it is not showing File is not available. 404.html has that line. I changed the error_page to 404.php and i deleted 404.html from server But i am still getting the same error message for wrong urls I did a grep -r "File is not available" / I didnt get any output. Where does the error message comes from? (HowTos)