rqt_graph error launching [closed]

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hi,

i am new to ros and i recently just started on the wiki tutorials. i am using ros groovy and ubuntu 12.10.

when i tried "$rosrun rqt_graph rqt_graph" in Understanding Ros Topics tutorial, this is my output:

WARNING(s) in /opt/ros/groovy/share/rqt_graph/package.xml: - The test dependency on "qt_dotgraph" is redundant with: run_depend - The test dependency on "rosgraph" is redundant with: run_depend - The test dependency on "roslib" is redundant with: run_depend - The test dependency on "rosnode" is redundant with: run_depend - The test dependency on "rosservice" is redundant with: run_depend - The test dependency on "rostopic" is redundant with: run_depend - The test dependency on "rqt_gui" is redundant with: run_depend WARNING(s) in /opt/ros/groovy/share/driver_base/package.xml: - The test dependency on "roscpp" is redundant with: build_depend, run_depend - The test dependency on "self_test" is redundant with: build_depend, run_depend - The test dependency on "diagnostic_updater" is redundant with: build_depend, run_depend - The test dependency on "dynamic_reconfigure" is redundant with: build_depend, run_depend WARNING(s) in /opt/ros/groovy/share/camera_info_manager/package.xml: - The test dependency on "rostest" is redundant with: build_depend, run_depend WARNING(s) in /opt/ros/groovy/share/diagnostic_analysis/package.xml: - The test dependency on "rosbag" is redundant with: build_depend, run_depend - The test dependency on "rostest" is redundant with: build_depend - The test dependency on "diagnostic_msgs" is redundant with: build_depend, run_depend WARNING(s) in /opt/ros/groovy/share/timestamp_tools/package.xml: - The test dependency on "roslib" is redundant with: build_depend, run_depend - The test dependency on "roscpp" is redundant with: build_depend, run_depend WARNING(s) in /opt/ros/groovy/share/rqt_dep/package.xml: - The test dependency on "qt_dotgraph" is redundant with: run_depend - The test dependency on "qt_gui_py_common" is redundant with: run_depend - The test dependency on "rqt_graph" is redundant with: run_depend - The test dependency on "rqt_gui" is redundant with: run_depend WARNING(s) in /opt/ros/groovy/share/rqt_logger_level/package.xml: - The test dependency on "rospy" is redundant with: run_depend - The test dependency on "rqt_gui" is redundant with: run_depend - The test dependency on "rqt_gui_py" is redundant with: run_depend Traceback (most recent call last): File "/usr/lib/pymodules/python2.7/rosdep2/rospack.py", line 55, in init_rospack_interface lookup = _get_default_RosdepLookup(Options()) File "/usr/lib/pymodules/python2.7/rosdep2/main.py", line 108, in _get_default_RosdepLookup lookup = RosdepLookup.create_from_rospkg(sources_loader=sources_loader) File "/usr/lib/pymodules/python2.7/rosdep2/lookup.py", line 319, in create_from_rospkg lookup._load_all_views(loader=sources_loader) File "/usr/lib/pymodules/python2.7/rosdep2/lookup.py", line 464, in _load_all_views self._load_view_dependencies(resource_name, loader) File "/usr/lib/pymodules/python2.7/rosdep2/lookup.py", line 486, in _load_view_dependencies loader.load_view(view_key, db, verbose=self.verbose) File "/usr/lib/pymodules/python2.7/rosdep2/sources_list.py", line 525, in load_view rosdep_db.set_view_data(view_name, source.rosdep_data, view_dependencies, view_name) File "/usr/lib/pymodules/python2.7/rosdep2/model.py", line 89, in set_view_data self._rosdep_db[view_name] = RosdepDatabaseEntry(rosdep_data.copy(), view_dependencies, origin) AttributeError: 'NoneType' object has no attribute 'copy' [rospack] Error: could not call python function 'rosdep2.rospack.init_rospack_interface' terminate called after throwing an instance of 'pluginlib::LibraryLoadException' what(): rospack could not find the ... (more)