Can't activate the plugin Parse error

Hello, I have installed the plugin, but I can’t activate it.
I receive an error at the top of the dashboard:

Parse error: syntax error, unexpected T_STRING in /path to by blog folder/wp-content/plugins/nginx-helper/nginx-helper.php on line 13

Could you help?

thanks!

http://ww.wp.xz.cn/extend/plugins/nginx-helper/