Error in initializing costmap - does not name a type [closed]

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Hi everyone,

I am writing a node in which I need to use the cost map. The following two lines show how I initialized the cost map and used the start() function.

tf::TransformListener tf1(ros::Duration(10));    
costmap_2d::Costmap2DROS* costmap_ros = new costmap_2d::Costmap2DROS("global_costmap", tf1);
costmap_ros->start();

But when I compile it, I get the following error -

/home/sonali/catkin_ws/src/dr_wheelchair/wall_follower/src/wall_follower.cpp:71:1: error: ‘costmap_ros’ does not name a type
 costmap_ros->start();
 ^
make[2]: *** [dr_wheelchair/wall_follower/CMakeFiles/wall_follower.dir/src/wall_follower.cpp.o] Error 1
make[1]: *** [dr_wheelchair/wall_follower/CMakeFiles/wall_follower.dir/all] Error 2
make: *** [all] Error 2
Invoking "make -j4 -l4" failed

Why does it say 'does not name a type' when I name it in just the previous line? What am I doing wrong?

I get the same error when I use the getRobotPose() function.

tf::Stamped<tf::Pose> global_pose;
costmap.getRobotPose(global_pose);

However, the program compiles without any errors when I try the getCostmap() function

costmap_2d::Costmap2D* costMapPointer = costmap.getCostmap();

These are the files i've included

#include "ros/ros.h"
#include "sensor_msgs/Range.h"
#include "geometry_msgs/Twist.h"
#include <costmap_2d/costmap_2d_ros.h>
#include <costmap_2d/costmap_2d.h>
#include <tf/transform_listener.h>
#include <iostream>
#include <string>

and I have included costmap_2d in the catkin required components of CMakeLists

Please let me know if you need more information to answer the question.

Thanks!