Visualizing Octomaps on RVIZ [closed]

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Hi, I am using the following link as a reference.

http://www2.informatik.uni-freiburg.d...

I wanted to display an octomap on RVIZ using a data set provided on

http://ais.informatik.uni-freiburg.de...

My code is provided below:

#include <ros/ros.h>
#include <octomap_msgs/conversions.h>
#include <octomap_msgs/Octomap.h>
#include <octomap_msgs/GetOctomap.h>
#include <octomap_ros/conversions.h>

int main(int argc, char** argv){
  ros::init(argc, argv, "octomap_read");
  ros::AsyncSpinner spinner(1);
  spinner.start();
  ros::NodeHandle nh;

  std::cout<<"Reading File"<<std::endl;

  octomap::OcTree* octree = new octomap::OcTree("freiburg1_360.bt");
  std::cout << "File Read Sccessfully" << std::endl;

  for(octomap::OcTree::leaf_iterator it = octree->begin_leafs(),
        end=octree->end_leafs(); it!= end; ++it)
    { 
        std::cout << "Node center: " << it.getCoordinate();
        std::cout << " value: " << it->getValue() << "\n";
    }

  octomap_msgs::Octomap bmap_msg;
  octomap_msgs::binaryMapToMsg(*octree, bmap_msg);

  ros::Publisher octomap_publisher = nh.advertise<octomap_msgs::Octomap>("display_env",1);

  octomap_publisher.publish(bmap_msg);

  while(octomap_publisher.getNumSubscribers() < 1)
  {
       ROS_WARN("Waiting for Subscribers");
  }

  ros::shutdown();
  return 0;
}

According to the reference link the file should be read correctly but the error I receive is:

ERROR: Filestream to freiburg1_360.bt not open, nothing read.

It is an error from within octomap::OcTree can someone help?