To be honest, I couldn't take a screenshot and write the error code all this time, because it was dumbly disappeared...Thats a Good idea, just posted a topic without mentioning the error, definitely you have got a solution as well which have posted in my lines as well :D
That's the thing, no, but the error was appearing. I'm glad it's gone. Thank you for your helpare apache and nginx serving the same site? can you access the nginx config on the server? usually in "etc/nginx/nginx.conf"
the default log location is "/var/log/nginx/accesslog"