Problem with navigation through rviz

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Hey everyone, I am trying to do the tutorial about navigation. I am able to create a map with gmapping. After that I would like the turtlebot to navigate with rviz and the 2D Nav Goal button. The problem is, it not working. When I start the amcl.demo and use roswtf I get following message:

Beginning tests of your ROS graph. These may take awhile...

analyzing graph...

... done analyzing graph

running graph rules...

Traceback (most recent call last):

File "/opt/ros/hydro/lib/python2.7/dist-packages/roswtf/__init__.py", line 204, in _roswtf_main

wtf_check_graph(ctx, names=names)

File "/opt/ros/hydro/lib/python2.7/dist-packages/roswtf/graph.py", line 412, in wtf_check_graph

error_rule(r, r[0](ctx), ctx)

File "/opt/ros/hydro/lib/python2.7/dist-packages/roswtf/graph.py", line 104, in ping_check

_, unpinged = rosnode.rosnode_ping_all()

File "/opt/ros/hydro/lib/python2.7/dist-packages/rosnode/__init__.py", line 392, in rosnode_ping_all

if rosnode_ping(node, max_count=1, verbose=verbose):

File "/opt/ros/hydro/lib/python2.7/dist-packages/rosnode/__init__.py", line 324, in rosnode_ping

pid = _succeed(node.getPid(ID))

File "/opt/ros/hydro/lib/python2.7/dist-packages/rosnode/__init__.py", line 78, in _succeed

raise ROSNodeException("remote call failed: %s"%msg)

ROSNodeException: remote call failed: not authorized

remote call failed: not authorized

Aborting checks, partial results summary:

Found 1 warning(s). Warnings are things that may be just fine, but are sometimes at fault

WARNING The following node subscriptions are unconnected:

• /camera/camera_nodelet_manager:
  • /tf_static
• /amcl:
  • /tf_static
  • /initialpose
• /mobile_base_nodelet_manager:
  • /mobile_base/commands/reset_odometry
  • /mobile_base/commands/external_power
  • /mobile_base/commands/sound
  • /mobile_base/commands/digital_output
  • /mobile_base/commands/led1
  • /mobile_base/commands/led2
  • /kobuki_safety_controller/enable
  • /mobile_base/commands/motor_power
  • /kobuki_safety_controller/disable
  • /cmd_vel_mux/input/teleop
  • /kobuki_safety_controller/reset
• /move_base:
  • /move_base/local_costmap/footprint
  • /move_base_simple/goal
  • /mobile_base/sensors/bumper_pointcloud
  • /tf_static
  • /move_base/global_costmap/footprint
  • /move_base/cancel
• /rviz:
  • /tf_static

Found 1 error(s).

ERROR Communication with [/master_sync_turtlebot_1025C_2800_1248496815] raised an error: list index out of range

I have no clue what to do... I am searching since few days. Can someone help me? I am using Hydro on Ubuntu 12.04

Greetings