502 Bad Gateway- Nginx and thin

[Yunior Miguel A.]

Whn I am go /tmp/thin.0.sock that file exist. Sometime when i am reset 
the thin read thin:
/var/lib/gems/1.9.1/gems/activesupport-3.2.12/lib/active_support/dependencies.rb:251:in 
`block in require': iconv will be deprecated in the future, use 
String#encode instead.

I am put the same port and change  server unix:/tmp/thin.sock;

and the log is the same.

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