Everything goes wrong with turtlebot tutorials !! [closed]

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Hello,

I don't know what is going on with my turtlebot2. I had many problems while I was working with turtlebot tutorials

http://www.ros.org/wiki/turtlebot/Tutorials

For example, when I try

roslaunch turtlebot_follower follower.launch

I get

... logging to /home/turtlebot/.ros/log/0dbf0a06-7957-11e2-8a07-446d57c58c65/roslaunch-turtlebot-1025C-3596.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://153.91.222.65:47181/

SUMMARY
========

PARAMETERS
 * /camera/depth/rectify_depth/interpolation
 * /camera/depthimage_to_laserscan_loader/output_frame_id
 * /camera/depthimage_to_laserscan_loader/range_min
 * /camera/follower/goal_z
 * /camera/follower/max_x
 * /camera/follower/max_y
 * /camera/follower/max_z
 * /camera/follower/min_x
 * /camera/follower/min_y
 * /camera/follower/x_scale
 * /camera/follower/z_scale
 * /camera/openni_camera_loader/depth_frame_id
 * /camera/openni_camera_loader/depth_mode
 * /camera/openni_camera_loader/depth_registration
 * /camera/openni_camera_loader/depth_time_offset
 * /camera/openni_camera_loader/image_mode
 * /camera/openni_camera_loader/image_time_offset
 * /camera/openni_camera_loader/rgb_frame_id
 * /follower_velocity_smoother/accel_lim_v
 * /follower_velocity_smoother/accel_lim_w
 * /follower_velocity_smoother/decel_factor
 * /follower_velocity_smoother/frequency
 * /follower_velocity_smoother/speed_lim_v
 * /follower_velocity_smoother/speed_lim_w
 * /rosdistro
 * /rosversion

NODES
  /camera/
    camera_nodelet_manager (nodelet/nodelet)
    depthimage_to_laserscan_loader (nodelet/nodelet)
    follower (nodelet/nodelet)
    openni_camera_loader (nodelet/nodelet)
  /camera/depth/
    points (nodelet/nodelet)
    rectify_depth (nodelet/nodelet)
  /
    follower_velocity_smoother (nodelet/nodelet)

ROS_MASTER_URI=http://153.91.222.65:11311

core service [/rosout] found
process[follower_velocity_smoother-1]: started with pid [4095]
process[camera/camera_nodelet_manager-2]: started with pid [4160]
process[camera/openni_camera_loader-3]: started with pid [4205]
[ERROR] [1361143832.773250146]: Failed to load nodelet [/camera/openni_camera_loader] of type [openni_camera/driver]: Failed to load library /opt/ros/groovy/lib//libopenni_nodelet.so. Make sure that you are calling the PLUGINLIB_EXPORT_CLASS macro in the library code, and that names are consistent between this macro and your XML. Error string: Could not load library (Poco exception = /opt/ros/groovy/lib//libopenni_nodelet.so: undefined symbol: _ZN12class_loader20class_loader_private22AbstractMetaObjectBaseC2ERKSsS3_)
[FATAL] [1361143832.787996783]: Service call failed!
[camera/openni_camera_loader-3] process has died [pid 4205, exit code 255, cmd /opt/ros/groovy/lib/nodelet/nodelet load openni_camera/driver camera_nodelet_manager __name:=openni_camera_loader __log:=/home/turtlebot/.ros/log/0dbf0a06-7957-11e2-8a07-446d57c58c65/camera-openni_camera_loader-3.log].
log file: /home/turtlebot/.ros/log/0dbf0a06-7957-11e2-8a07-446d57c58c65/camera-openni_camera_loader-3*.log
respawning...
[camera/openni_camera_loader-3] restarting process
process[camera/openni_camera_loader-3]: started with pid [4271]
process[camera/depth/rectify_depth-4]: started with pid [4310]
[ERROR] [1361143833.785294962]: Failed to load nodelet [/camera/openni_camera_loader] of type [openni_camera/driver]: MultiLibraryClassLoader: Could not create object of class type openni_camera::DriverNodelet as no factory exists for it. Make sure that the library exists and was explicitly loaded through MultiLibraryClassLoader::loadLibrary()
[FATAL] [1361143833.802495745]: Service call failed!
[ERROR] [1361143833.803931278]: Failed to find nodelet with name '/camera/depth/rectify_depth' to unload.
[FATAL] [1361143833.809957110]: Service call failed!

also, when I try

roslaunch turtlebot_navigation gmapping_demo.launch

I get

... logging to /home/turtlebot/.ros/log/0dbf0a06-7957-11e2-8a07-446d57c58c65/roslaunch-turtlebot-1025C-15139.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://153.91.222.65:47114/

SUMMARY
========

PARAMETERS
 * /camera/depthimage_to_laserscan_loader/output_frame_id
 * /camera/depthimage_to_laserscan_loader/range_min
 * /camera/openni_camera_loader/depth_frame_id
 * /camera/openni_camera_loader/depth_mode
 * /camera/openni_camera_loader/depth_registration
 * /camera/openni_camera_loader/depth_time_offset
 * /camera/openni_camera_loader/image_mode
 * /camera/openni_camera_loader/image_time_offset
 * /camera/openni_camera_loader/rgb_frame_id
 * /move_base/TrajectoryPlannerROS/acc_lim_th
 * /move_base/TrajectoryPlannerROS/acc_lim_x
 * /move_base/TrajectoryPlannerROS/acc_lim_y
 * /move_base/TrajectoryPlannerROS/dwa
 * /move_base ...