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I just found the error. It is in here

robot.OdomCombinedSubscriber = nh.subscribe<nav_msgs::odometry>("/robot_pose_ekf/odom_combined", 10, &TurtlebotRobot::OdometryCombinedCallback, &robot);

The message type should be geometry_msgs::PoseWithCovarianceStamped and not <nav_msgs::odometry>

I changed instruction to robot.OdomCombinedSubscriber = nh.subscribe<geometry_msgs::posewithcovariancestamped>("/robot_pose_ekf/odom_combined", 10, &TurtlebotRobot::OdometryCombinedCallback, &robot); and it worked!

I just found the error. It is in here

robot.OdomCombinedSubscriber = nh.subscribe<nav_msgs::odometry>("/robot_pose_ekf/odom_combined", 10, &TurtlebotRobot::OdometryCombinedCallback, &robot);
&robot);

robot.OdomCombinedSubscriber = nh.subscribe<geometry_msgs::posewithcovariancestamped>("/robot_pose_ekf/odom_combined", nh.subscribe<geometry_msgs::PoseWithCovarianceStamped>("/robot_pose_ekf/odom_combined", 10,  &TurtlebotRobot::OdometryCombinedCallback, &robot);