Problems with hector_slam/ Tutorial

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I am trying to run the tutorial with hector_slam_launch tutorial.launch with Hydro. This is the error that I keep getting:

leaf@leaf:~$ roslaunch hector_slam_launch tutorial.launch
... logging to /home/leaf/.ros/log/14c6a7e2-6008-11e5-9b56-5cd99897b32a/roslaunch-leaf-2187.log
Checking log directory for disk usage. This may take awhile.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

started roslaunch server http://leaf.local:41228/

SUMMARY
========

PARAMETERS
 * /hector_geotiff_node/draw_background_checkerboard
 * /hector_geotiff_node/draw_free_space_grid
 * /hector_geotiff_node/geotiff_save_period
 * /hector_geotiff_node/map_file_base_name
 * /hector_geotiff_node/map_file_path
 * /hector_geotiff_node/plugins
 * /hector_mapping/advertise_map_service
 * /hector_mapping/base_frame
 * /hector_mapping/laser_z_max_value
 * /hector_mapping/laser_z_min_value
 * /hector_mapping/map_frame
 * /hector_mapping/map_multi_res_levels
 * /hector_mapping/map_resolution
 * /hector_mapping/map_size
 * /hector_mapping/map_start_x
 * /hector_mapping/map_start_y
 * /hector_mapping/map_update_angle_thresh
 * /hector_mapping/map_update_distance_thresh
 * /hector_mapping/odom_frame
 * /hector_mapping/pub_map_odom_transform
 * /hector_mapping/scan_subscriber_queue_size
 * /hector_mapping/scan_topic
 * /hector_mapping/tf_map_scanmatch_transform_frame_name
 * /hector_mapping/update_factor_free
 * /hector_mapping/update_factor_occupied
 * /hector_mapping/use_tf_pose_start_estimate
 * /hector_mapping/use_tf_scan_transformation
 * /hector_trajectory_server/source_frame_name
 * /hector_trajectory_server/target_frame_name
 * /hector_trajectory_server/trajectory_publish_rate
 * /hector_trajectory_server/trajectory_update_rate
 * /rosdistro
 * /rosversion
 * /use_sim_time

NODES
  /
    hector_geotiff_node (hector_geotiff/geotiff_node)
    hector_mapping (hector_mapping/hector_mapping)
    hector_trajectory_server (hector_trajectory_server/hector_trajectory_server)
    rviz (rviz/rviz)

ROS_MASTER_URI=http://localhost:11311

core service [/rosout] found
process[rviz-1]: started with pid [2205]
ERROR: cannot launch node of type [hector_mapping/hector_mapping]: can't locate node [hector_mapping] in package [hector_mapping]
ERROR: cannot launch node of type [hector_trajectory_server/hector_trajectory_server]: can't locate node [hector_trajectory_server] in package [hector_trajectory_server]
ERROR: cannot launch node of type [hector_geotiff/geotiff_node]: can't locate node [geotiff_node] in package [hector_geotiff]

Any help would be very appreciated. Thanks!