Problems with gazebo plugin tutorials

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Hi, I am now doing the gazebo plugin tutorial and came across some difficulties doing rosmake. My cpp file is

#include "gazebo.hh"
#include "physics/physics.h" 
#include "common/Events.hh" 
#include "common/Plugin.hh" 
#include "common/Time.hh" 
#include "common/common.h"


namespace gazebo
{
  class PluginTemplate : public Plugin
  {
    public: PluginTemplate() : Plugin() 
            {
            }

    public: void Load( sdf::ElementPtr &_sdf )
            {
            };


  };

  GZ_REGISTER_PLUGIN(PluginTemplate)

}

However, I got the following error while running rosmake

"home/chengxiang/gazebo_tutorials/src/simple_world_plugin.cpp:26:1: error: expected constructor, destructor, or type conversion before ‘}’ token"

the "}" in question here is the last "}"

Could any kind soul please enlighten me on how to solve this issue?