Quickstart_in_rivz problem

[AtariaLee]

Description

im learning moveit2 in ros2-foxy.when i run ros2 launch moveit2_tutorials demo.launch.py rviz_tutorial:=true by following https://github.com/ros-planning/moveit2_tutorials/blob/main/doc/quickstart_in_rviz/quickstart_in_rviz_tutorial.rst, an error happend.
I would be very thankful for your help!!

Your environment

• ROS Distro: |Foxy|
• OS Version: e.g. Ubuntu 20.04
• maybe source?

Steps to reproduce

demo and files in https://github.com/ros-planning/moveit2_tutorials/blob/main/doc/quickstart_in_rviz/quickstart_in_rviz_tutorial.rst

Expected behaviour

when i run ros2 launch moveit2_tutorials demo.launch.py rviz_tutorial:=true by following https://github.com/ros-planning/moveit2_tutorials/blob/main/doc/quickstart_in_rviz/quickstart_in_rviz_tutorial.rst, an error happend.

Backtrace or Console output

lee@lee-VirtualBox:~/ws_moveit2$ ros2 launch moveit2_tutorials demo.launch.py rviz_tutorial:=true
[INFO] [launch]: All log files can be found below /home/lee/.ros/log/2021-04-10-18-23-32-079928-lee-VirtualBox-17769
[INFO] [launch]: Default logging verbosity is set to INFO
Task exception was never retrieved
future: <Task finished name='Task-2' coro=<LaunchService._process_one_event() done, defined at /opt/ros/foxy/lib/python3.8/site-packages/launch/launch_service.py:271> exception=InvalidLaunchFileError('py')>
Traceback (most recent call last):
File "/opt/ros/foxy/lib/python3.8/site-packages/launch/launch_description_sources/any_launch_file_utilities.py", line 53, in get_launch_description_from_any_launch_file
return loader(launch_file_path)
File "/opt/ros/foxy/lib/python3.8/site-packages/launch/launch_description_sources/python_launch_file_utilities.py", line 68, in get_launch_description_from_python_launch_file
return getattr(launch_file_module, 'generate_launch_description')()
File "/home/lee/ws_moveit2/install/moveit2_tutorials/share/moveit2_tutorials/launch/demo.launch.py", line 71, in generate_launch_description
run_move_group_node = Node(package='moveit_ros_move_group',
File "/opt/ros/foxy/lib/python3.8/site-packages/launch_ros/actions/node.py", line 196, in init
normalized_params = normalize_parameters(parameters)
File "/opt/ros/foxy/lib/python3.8/site-packages/launch_ros/utilities/normalize_parameters.py", line 181, in normalize_parameters
normalized_params.append(normalize_parameter_dict(param))
File "/opt/ros/foxy/lib/python3.8/site-packages/launch_ros/utilities/normalize_parameters.py", line 162, in normalize_parameter_dict
raise TypeError('Unexpected type for parameter value {}'.format(repr(value)))
TypeError: Unexpected type for parameter value None

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/opt/ros/foxy/lib/python3.8/site-packages/launch/launch_service.py", line 273, in _process_one_event
await self.__process_event(next_event)
File "/opt/ros/foxy/lib/python3.8/site-packages/launch/launch_service.py", line 293, in __process_event
visit_all_entities_and_collect_futures(entity, self.__context))
File "/opt/ros/foxy/lib/python3.8/site-packages/launch/utilities/visit_all_entities_and_collect_futures_impl.py", line 45, in visit_all_entities_and_collect_futures
futures_to_return += visit_all_entities_and_collect_futures(sub_entity, context)
File "/opt/ros/foxy/lib/python3.8/site-packages/launch/utilities/visit_all_entities_and_collect_futures_impl.py", line 45, in visit_all_entities_and_collect_futures
futures_to_return += visit_all_entities_and_collect_futures(sub_entity, context)
File "/opt/ros/foxy/lib/python3.8/site-packages/launch/utilities/visit_all_entities_and_collect_futures_impl.py", line 38, in visit_all_entities_and_collect_futures
sub_entities = entity.visit(context)
File "/opt/ros/foxy/lib/python3.8/site-packages/launch/action.py", line 108, in visit
return self.execute(context)
File "/opt/ros/foxy/lib/python3.8/site-packages/launch/actions/include_launch_description.py", line 125, in execute
launch_description = self.__launch_description_source.get_launch_description(context)
File "/opt/ros/foxy/lib/python3.8/site-packages/launch/launch_description_source.py", line 84, in get_launch_description
self._get_launch_description(self.__expanded_location)
File "/opt/ros/foxy/lib/python3.8/site-packages/launch/launch_description_sources/any_launch_description_source.py", line 53, in _get_launch_description
return get_launch_description_from_any_launch_file(location)
File "/opt/ros/foxy/lib/python3.8/site-packages/launch/launch_description_sources/any_launch_file_utilities.py", line 56, in get_launch_description_from_any_launch_file
raise InvalidLaunchFileError(extension, likely_errors=exceptions)
launch.invalid_launch_file_error.InvalidLaunchFileError: Caught exception when trying to load file of format [py]: Unexpected type for parameter value None

[vatanaksoytezer]

@AtariaLee I will send a PR soon to fix this. In the mean time you can check out https://github.com/ros-planning/moveit2/tree/main/moveit_demo_nodes/run_move_group to achieve a very similar behaviour.

[AtariaLee]

I tried the new files,but i have the same problem.

[vatanaksoytezer]

Are you using the current master branch of moveit2?

Did you try this?

The PR is not merged yet so if you want to use the fix, you need to pull my branch of moveit2_tutorials (until it is merged) here: https://github.com/vatanaksoytezer/moveit2_tutorials/tree/fix/move_group

[AtariaLee]

sorry,i am new learner in ros2.it seems that many demos and files are not ported to moveit2,like python interface demos and others. @vatanaksoytezer

[vatanaksoytezer]

No worries @AtariaLee. Most tutorials are not ported yet to ros2. But the ported (and merged) ones should work without any problems for now.

[AtariaLee]

@vatanaksoytezer .thanks a lot!!!but its still too difficult for me to learn moveit2 in ros2 by following tutorials.
By following tutorials ,so many problems was happend,and im a rookie in ros2 and moveit2,so i dont konw how to fix it. That really bothers me.

[MarqRazz]

@AtariaLee, I'm sorry you are seeing issues but these tutorials are still a work in progress. If there is a warning at the top like this then it has low chances of working for you.

Are you sure your workspace is up to date? The launch file you are attempting to run works on my machine.

You can update your workspace by cd'ing into it and running vcs pull src

Here are the packages I have in my src folder this is what it looks like when I ask vcs to update it (FYI you will probably not have moveit_task_constructor in yours)

[AtariaLee]

@MarqRazz After i update my files,its worked.But i mean there still a lot of tutorials are not worked for moveit2.
And thanks a lot for everyones help!!!

[newcanopies]

Am I missing a step?

These three work:
ros2 launch run_moveit_cpp run_moveit_cpp.launch.py LOADS Rviz (image left) Tutorial page
ros2 launch run_move_group run_move_group.launch.py Tutorial page
ros2 launch run_move_group run_move_group_interface.launch.py LOADS Xterm

This one loads BLANK:
ros2 launch moveit2_tutorials demo.launch.py rviz_tutorial:=true BLANK Rviz (image middle)

Launch log here https://gist.github.com/newcanopies/3e74554c20cfeddd88cb51d99dd52329

Rviz still blank after ~/ws_ROS2/moveit2$ vcs pull src
and this Fork is not available to git pull https://github.com/vatanaksoytezer/moveit2_tutorials/tree/fix/move_group
thank you!

[vatanaksoytezer]

@newcanopies We've already merged my fork. Rviz should be blank with rviz_tutorial:=true flag which is meant for you to follow the quickstart tutorial here and add the rviz plugins yourself. If you want an already filled scene you shoud remove rviz_tutorial:=true flag and run as ros2 launch moveit2_tutorials demo.launch.py.

Let me know if you still have something unexpected after that.

[vatanaksoytezer]

But it seems you have trouble with mongo, I will try to recreate it in my local machine and see if I can find anything. Let me know if ros2 launch moveit2_tutorials demo.launch.py works as expected.