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Thanks. I tried "sudo pip uninstall rosdep" and the rosdep was removed successfully, as files in the directory "/usr/local/lib/python2.7/dist-packages" disappeared.

However, the command "rosrun rviz rviz" still leads to the following errors:

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 rviz package containing rviz::Panel Aborted (core dumped)

Thanks. I tried "sudo pip uninstall rosdep" and the rosdep was removed successfully, as files in the directory "/usr/local/lib/python2.7/dist-packages" disappeared.

However, the command "rosrun rviz rviz" still leads to the following errors:

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' 'copy'

[rospack] Error: could not call python function 'rosdep2.rospack.init_rospack_interface' rosdep2.rospack.init_rospack_interface'

terminate called after throwing an instance of 'pluginlib::LibraryLoadException' what(): rospack could not find the rviz package containing rviz::Panel Aborted (core dumped)