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add these lines in the first of your program:

   * The ros::init() function needs to see argc and argv so that it can perform
   * any ROS arguments and name remapping that were provided at the command line. For programmatic
   * remappings you can use a different version of init() which takes remappings
   * directly, but for most command-line programs, passing argc and argv is the easiest
   * way to do it.  The third argument to init() is the name of the node.
   * You must call one of the versions of ros::init() before using any other
   * part of the ROS system.
  ros::init(argc, argv, "Timer");

   * NodeHandle is the main access point to communications with the ROS system.
   * The first NodeHandle constructed will fully initialize this node, and the last
   * NodeHandle destructed will close down the node.
  ros::NodeHandle n;

and also you nee incude:

#include "ros/ros.h"