运行puppet help node_gce命令时出现以下错误：
[root@puppetmaster ~]# puppet help node_gce
Faraday: you may want to install system_timer for reliable timeouts
Error: Could not autoload puppet/face/node_gce/add_metadata: "--user=": already defined in puppet
Error: Could not load help for the face node_gce.
Please check the error logs for more information.
Detail: "Could not autoload puppet/face/node_gce/add_metadata: "--user=": already defined in puppet"
Error: Try 'puppet help help help' for usage
任何帮助将不胜感激。