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2012-09-05 22:54:27 -0500	commented question	Tutorial Building a ROS Package: "Rosdep experienced an internal error: 'NoneType' object has no attribute 'copy'" I meant "1.2 Creating an new ROS package". Maybe I misunderstood but I interpreted "Now go into the ~/fuerte_workspace/sandbox directory" and "Alternatively, if you use Fuerte or later release, you can simply do: $ roscd" in the sense that both do the same, i.e. bring me to the sandbox directory.
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2012-09-02 01:08:08 -0500	asked a question	Tutorial Building a ROS Package: "Rosdep experienced an internal error: 'NoneType' object has no attribute 'copy'" Hi! I'm new to to ROS and Linux. I'm running ROS Fuerte on Ubuntu 12.04. While going through the "BuildingPackages" tutorial I experienced a problem. After typing `rosdep install turtlesim` I get the error message: ERROR: Rosdep experienced an internal error: 'NoneType' object has no attribute 'copy' Please go to the rosdep page [1] and file a bug report with the stack trace below. [1] : http://www.ros.org/wiki/rosdep Traceback (most recent call last): File "/usr/local/lib/python2.7/dist-packages/rosdep-0.9.3-py2.7.egg/rosdep2/main.py", line 111, in rosdep_main exit_code = _rosdep_main(args) File "/usr/local/lib/python2.7/dist-packages/rosdep-0.9.3-py2.7.egg/rosdep2/main.py", line 232, in _rosdep_main return _package_args_handler(command, parser, options, args) File "/usr/local/lib/python2.7/dist-packages/rosdep-0.9.3-py2.7.egg/rosdep2/main.py", line 255, in _package_args_handler lookup = _get_default_RosdepLookup(options) File "/usr/local/lib/python2.7/dist-packages/rosdep-0.9.3-py2.7.egg/rosdep2/main.py", line 103, in _get_default_RosdepLookup lookup = RosdepLookup.create_from_rospkg(sources_loader=sources_loader) File "/usr/local/lib/python2.7/dist-packages/rosdep-0.9.3-py2.7.egg/rosdep2/lookup.py", line 298, in create_from_rospkg lookup._load_all_views(loader=sources_loader) File "/usr/local/lib/python2.7/dist-packages/rosdep-0.9.3-py2.7.egg/rosdep2/lookup.py", line 426, in _load_all_views self._load_view_dependencies(resource_name, loader) File "/usr/local/lib/python2.7/dist-packages/rosdep-0.9.3-py2.7.egg/rosdep2/lookup.py", line 448, in _load_view_dependencies loader.load_view(view_key, db, verbose=self.verbose) File "/usr/local/lib/python2.7/dist-packages/rosdep-0.9.3-py2.7.egg/rosdep2/sources_list.py", line 505, in load_view rosdep_db.set_view_data(view_name, source.rosdep_data, view_dependencies, view_name) File "/usr/local/lib/python2.7/dist-packages/rosdep-0.9.3-py2.7.egg/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' Maybe I somehow messed up my installation... I already did a reinstallation of Fuerte but the problem persists. For I'm absolutely new to ROS and Ubuntu I have no clue how to solve or even further analyze the problem. I would very much appreciate any hints what to do at this point? Thank you very much! EDIT: It's this part of the tutorial I have the mentioned problems with. When I run `$ sudo rosdep init` I get `malte@ubuntu:~$ sudo rosdep init [sudo] password for malte: ERROR: default sources list file already exists: /etc/ros/rosdep/sources.list.d/20-default.list Please delete if you wish to re-initialize` When I run `$ rosdep update` I get the error message `malte@ubuntu:~$ rosdep update reading in sources list data from /etc/ros/rosdep/sources.list.d Hit https://github.com/ros/rosdistro/raw/master/rosdep/osx-homebrew.yaml Hit https://github.com/ros/rosdistro/raw/master/rosdep/gentoo.yaml Hit https://github.com/ros/rosdistro/raw/master/rosdep/base.yaml Hit https://github.com/ros/rosdistro/raw/master/rosdep/python.yaml ERROR: unable to process source [https://github.com/ros/rosdistro/raw/master/releases/fuerte.yaml]: Failed ...` (more)