Hi,
I wanted to start my launch file from command line with following command
ros2 launch <pkg_name> <file>
now i got this error:
Failed to load entry point 'launch': cannot import name 'get_typed_value' from 'launch.frontend.type_utils' (/home/lwnmil2/develop_ws/install/launch/lib/python3.8/site-packages/launch/frontend/type_utils.py)
Traceback (most recent call last):
File "/opt/ros/foxy/bin/ros2", line 11, in <module>
load_entry_point('ros2cli==0.9.7', 'console_scripts', 'ros2')()
File "/opt/ros/foxy/lib/python3.8/site-packages/ros2cli/cli.py", line 39, in main
add_subparsers_on_demand(
File "/opt/ros/foxy/lib/python3.8/site-packages/ros2cli/command/__init__.py", line 236, in add_subparsers_on_demand
extension = command_extensions[name]
KeyError: 'launch'
When I open the help of the ros2 command the same error message is shown and there is no entry for the ros2 command:
ros2 -h
Failed to load entry point 'launch': cannot import name 'get_typed_value' from 'launch.frontend.type_utils' (/home/lwnmil2/develop_ws/install/launch/lib/python3.8/site-packages/launch/frontend/type_utils.py)
usage: ros2 [-h] Call `ros2 <command> -h` for more detailed usage. ...
ros2 is an extensible command-line tool for ROS 2.
optional arguments:
-h, --help show this help message and exit
Commands:
action Various action related sub-commands
bag Various rosbag related sub-commands
component Various component related sub-commands
daemon Various daemon related sub-commands
doctor Check ROS setup and other potential issues
interface Show information about ROS interfaces
lifecycle Various lifecycle related sub-commands
multicast Various multicast related sub-commands
node Various node related sub-commands
param Various param related sub-commands
pkg Various package related sub-commands
run Run a package specific executable
security Various security related sub-commands
service Various service related sub-commands
topic Various topic related sub-commands
wtf Use `wtf` as alias to `doctor`
Call `ros2 <command> -h` for more detailed usage.
What is broken on my system? and how can i fix it? I use Ubuntu 20.04 with foxy
Originally posted by lmiller on ROS Answers with karma: 219 on 2020-08-10
Post score: 0
Original comments
Comment by drewbeller on 2022-02-08:
Seeing the same issue, I don't have a package called launch though
it was working previously in my environment before but then stopped and i'm not sure what changed. test is also not being found. I've tried initializing my workspace and packages from scratch but still have the same issue
Comment by jarvisschultz on 2022-02-11:
@drewbeller Please do not post answers that are not actually answers. I've converted your answer to a comment. If you have a new question, please open a new question. Thanks!