Hi all,

Do I need to install pr2_gazebo to use the command:
roslaunch gazebo_worlds empty_world.launch ? Even if I won't use the PR2 
robot?

I just installed gazebo_tools and gazebo_worlds but I get an error when 
I try to start empty_world. (see below)

Cheers,

Ugo



Traceback (most recent call last):
   File "/home/hand/ros/ros/tools/roslaunch/src/roslaunch/__init__.py", 
line 198, in main
     p.start()
   File "/home/hand/ros/ros/tools/roslaunch/src/roslaunch/parent.py", 
line 217, in start
     self._start_infrastructure()
   File "/home/hand/ros/ros/tools/roslaunch/src/roslaunch/parent.py", 
line 180, in _start_infrastructure
     self._load_config()
   File "/home/hand/ros/ros/tools/roslaunch/src/roslaunch/parent.py", 
line 106, in _load_config
     self.config = 
roslaunch.config.load_config_default(self.roslaunch_files, self.port)
   File "/home/hand/ros/ros/tools/roslaunch/src/roslaunch/config.py", 
line 371, in load_config_default
     loader.load(f, config, verbose=verbose)
   File "/home/hand/ros/ros/tools/roslaunch/src/roslaunch/xmlloader.py", 
line 662, in load
     self._load_launch(launch, ros_config, is_core=core, 
filename=filename, verbose=verbose)
   File "/home/hand/ros/ros/tools/roslaunch/src/roslaunch/xmlloader.py", 
line 637, in _load_launch
     self._recurse_load(ros_config, launch.childNodes, 
self.root_context, None, is_core, verbose)
   File "/home/hand/ros/ros/tools/roslaunch/src/roslaunch/xmlloader.py", 
line 590, in _recurse_load
     n = self._node_tag(tag, context.child(''), ros_config, 
default_machine, verbose=verbose)
   File "/home/hand/ros/ros/tools/roslaunch/src/roslaunch/xmlloader.py", 
line 359, in _node_tag
     self._env_tag(t, context, ros_config)
   File "/home/hand/ros/ros/tools/roslaunch/src/roslaunch/xmlloader.py", 
line 502, in _env_tag
     self.load_env(context, ros_config, *self.reqd_attrs(tag, context, 
XmlLoader.ENV_ATTRS))
   File "/home/hand/ros/ros/tools/roslaunch/src/roslaunch/xmlloader.py", 
line 175, in reqd_attrs
     return [self.resolve_args(tag.attributes[a].value, context) for a 
in attrs]
   File "/home/hand/ros/ros/tools/roslaunch/src/roslaunch/xmlloader.py", 
line 146, in resolve_args
     return roslib.substitution_args.resolve_args(args, 
context=context.resolve_dict, resolve_anon=self.resolve_anon)
   File 
"/home/hand/ros/ros/core/roslib/src/roslib/substitution_args.py", line 
105, in resolve_args
     resolved = resolved[0:idx-len(arg)] + 
roslib.packages.get_pkg_dir(args[0]) + resolved[idx:]
   File "/home/hand/ros/ros/core/roslib/src/roslib/packages.py", line 
213, in get_pkg_dir
     raise InvalidROSPkgException("Cannot locate installation of package 
%s: %s. ROS_ROOT[%s] ROS_PACKAGE_PATH[%s]"%(package, rperr.strip(), 
ros_root, ros_package_path))
InvalidROSPkgException: Cannot locate installation of package 
pr2_gazebo_plugins: [rospack] couldn't find package 
[pr2_gazebo_plugins]. ROS_ROOT[/home/hand/ros/ros] 
ROS_PACKAGE_PATH[/home/hand/ros/stacks:/home/hand/Projects/Projects/ROS_can_interface/shadowhand]



-- 
Ugo Cupcic         |  Shadow Robot Company | ugo@shadowrobot.com
Software Engineer      251 Liverpool Road
need a Hand?           London  N1 1LX       | +44 20 7700 2487
http://www.shadowrobot.com/hand/              @shadowrobot