nginx启动时出现未知错误？

Question

当我开始并配置测试nginx时。我的下面有一个未知错误

sudo service nginx configtest
nginx: the configuration file /opt/nginx/conf/nginx.conf syntax is ok
nginx: [alert] Unable to start the Phusion Passenger watchdog because it encountered the following error during startup: Unable to start the Phusion Passenger helper agent: it seems to have crashed during startup for an unknown reason, with exit code 1 (-1: Unknown error)

我的配置文件看起来像

#user  nobody;
worker_processes  1;


#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;


events {
    worker_connections  1024;
}


http {
    passenger_root /home/sarath/.rvm/gems/ruby-2.1.0/gems/passenger-4.0.53;
    passenger_ruby /home/sarath/.rvm/gems/ruby-2.1.0/wrappers/ruby;

    include       mime.types;
    default_type  application/octet-stream;
    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;
gzip on;
  gzip_vary on;
  gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;
    server {
        listen       81;
        server_name  localhost;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

       location / {
            root   html;
            index  index.html index.htm;
        }

        #error_page  404              /404.html;

        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }

server {
    listen       8989;
    server_name  XXXXXXXXXX;

    root /home/sarath/ruby_project/rub/public;
    client_max_body_size 128M;
    passenger_enabled on;
    rails_env production;

    location ~ ^/(assets|fonts|images|javascripts|stylesheets|system)/ {
      expires max;
      add_header Cache-Control public;
    }
  }
}

我在浏览器中的输出是：

We're sorry, but something went wrong.

We've been notified about this issue and we'll take a look at it shortly.

我的应用程序是使用生产environemnt测试好的导轨上的红宝石