duplicate MIME type “text/html”?

I have this in Nginx configuration files

text/plain text/html text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;
but Nginx give error …

nginx 502 bad gateway

I get a 502 Bad Gateway with nginx when using spawn fcgi to spawn php5-cgi.

I use this to span an instance on server start using the following line in rc.local

/usr/bin/spawn-fcgi -a -p …