An 502 error in Nginx while using ruby(php work well on it)

An 502 error in Nginx while using ruby(php work well on it)

here is my configfile under flow:
127.0.0.1/bin/index.rb upstream prematurely closed FastCGI stdout while
reading response header from upstream, client: 127.0.0.1, server:
127.0.0.1, request: "GET /bin/ HTTP/1.1", upstream:
"fastcgi://unix:/var/run/fcgiwrap.socket:", host: "127.0.0.1"
server{ listen 80;
server_name 127.0.0.1;
root /home/ang/website;
index index.rb index.html;
location /otrs-web {
gzip on;
alias /opt/otrs/var/httpd/htdocs;
}
location ~ \.rb$ {
gzip off;
fastcgi_pass unix:/var/run/fcgiwrap.socket;
fastcgi_index index.rb;
fastcgi_param SCRIPT_FILENAME /home/ang/website/bin$1;
fastcgi_param QUERY_STRING $query_string;
fastcgi_param REQUEST_METHOD $request_method;
fastcgi_param CONTENT_TYPE $content_type;
fastcgi_param CONTENT_LENGTH $content_length;
fastcgi_param GATEWAY_INTERFACE CGI/1.1;
fastcgi_param SERVER_SOFTWARE nginx;
fastcgi_param SCRIPT_NAME $fastcgi_script_name;
fastcgi_param REQUEST_URI $request_uri;
fastcgi_param DOCUMENT_URI $document_uri;
fastcgi_param DOCUMENT_ROOT $document_root;
fastcgi_param SERVER_PROTOCOL $server_protocol;
fastcgi_param REMOTE_ADDR $remote_addr;
fastcgi_param REMOTE_PORT $remote_port;
fastcgi_param SERVER_ADDR $server_addr;
fastcgi_param SERVER_PORT $server_port;
fastcgi_param SERVER_NAME $server_name;
}
}