trying exploration stack [closed]

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Hi, i am working on irobot create and made a map with gmapping ,, Now i have the map bit i am trying to make the robot walk on the hole room by a plan ,, So i have tryied exploration stack to make the robot walk on the hole room

i loaded my map from /temp on RVIZ and run :

rosrun explore explore

the error is :

Done exploring with 0 goals left that could not be reached. There are 0 goals on our blacklist, and 0 of the frontier goals are too close to them to pursue. The rest had global planning fail to them.
Exploration finished. Hooray.

then i have tried the explore_stage Package to see it when i command :

roslaunch roslaunch explore_stage explore_slam.launch

the result is :

... logging to /home/salma/.ros/log/841f8926-96f5-11e2-84ae-00e04c4d0e3f/roslaunch-salma-G31M-S2L-2379.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.

WARNING: ignoring defunct <master /> tag
Traceback (most recent call last):
  File "/opt/ros/fuerte/lib/python2.7/dist-packages/roslaunch/__init__.py", line 257, in main
    p.start()
  File "/opt/ros/fuerte/lib/python2.7/dist-packages/roslaunch/parent.py", line 257, in start
    self._start_infrastructure()
  File "/opt/ros/fuerte/lib/python2.7/dist-packages/roslaunch/parent.py", line 206, in _start_infrastructure
    self._load_config()
  File "/opt/ros/fuerte/lib/python2.7/dist-packages/roslaunch/parent.py", line 121, in _load_config
    self.config = roslaunch.config.load_config_default(self.roslaunch_files, self.port, verbose=self.verbose)
  File "/opt/ros/fuerte/lib/python2.7/dist-packages/roslaunch/config.py", line 421, in load_config_default
    loader.load(f, config, verbose=verbose)
  File "/opt/ros/fuerte/lib/python2.7/dist-packages/roslaunch/xmlloader.py", line 694, in load
    self._load_launch(launch, ros_config, is_core=core, filename=filename, argv=argv, verbose=verbose)
  File "/opt/ros/fuerte/lib/python2.7/dist-packages/roslaunch/xmlloader.py", line 666, in _load_launch
    self._recurse_load(ros_config, launch.childNodes, self.root_context, None, is_core, verbose)
  File "/opt/ros/fuerte/lib/python2.7/dist-packages/roslaunch/xmlloader.py", line 601, in _recurse_load
    n = self._node_tag(tag, context.child(''), ros_config, default_machine, verbose=verbose)
  File "/opt/ros/fuerte/lib/python2.7/dist-packages/roslaunch/xmlloader.py", line 95, in call
    return f(*args, **kwds)
  File "/opt/ros/fuerte/lib/python2.7/dist-packages/roslaunch/xmlloader.py", line 347, in _node_tag
    self.opt_attrs(tag, context, ('machine', 'args', 'output', 'respawn', 'cwd', 'launch-prefix', 'required'))
  File "/opt/ros/fuerte/lib/python2.7/dist-packages/roslaunch/xmlloader.py", line 178, in opt_attrs
    return [self.resolve_args(tag_value(tag,a), context) for a in attrs]
  File "/opt/ros/fuerte/lib/python2.7/dist-packages/roslaunch/xmlloader.py", line 159, in resolve_args
    return substitution_args.resolve_args(args, context=context.resolve_dict, resolve_anon=self.resolve_anon)
  File "/opt/ros/fuerte/lib/python2.7/dist-packages/roslaunch/substitution_args.py", line 203, in resolve_args
    resolved = _find(resolved, a, args, context)
  File "/opt/ros/fuerte/lib/python2.7/dist-packages/roslaunch/substitution_args.py", line 139, in _find
    return resolved[0:idx-len(arg)] + r.get_path(args[0]) + resolved[idx:]
  File "/usr/lib/pymodules/python2.7/rospkg/rospack.py", line 149 ...