Issues with launching the launch file

[arun-venkat-23]

Executed the below command when in the directory where this file is present: ros2 launch yolov8.launch.py

Error: [INFO] [launch]: All log files can be found below /home/arunvenkat/.ros/log/2023-09-28-23-26-26-077037 [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:226> exception=PackageNotFoundError("package 'yolov8_ros' not found, searching: ['/opt/ros/foxy']")> Traceback (most recent call last): File "/opt/ros/foxy/lib/python3.8/site-packages/ament_index_python/packages.py", line 50, in get_package_prefix content, package_prefix = get_resource('packages', package_name) File "/opt/ros/foxy/lib/python3.8/site-packages/ament_index_python/resources.py", line 48, in get_resource raise LookupError( LookupError: Could not find the resource 'yolov8_ros' of type 'packages'

During handling of the above exception, another exception occurred:

Traceback (most recent call last): File "/opt/ros/foxy/lib/python3.8/site-packages/launch/launch_service.py", line 228, in _process_one_event await self.process_event(next_event) File "/opt/ros/foxy/lib/python3.8/site-packages/launch/launch_service.py", line 248, 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 45, in visit_all_entities_and_collect_futures futures_to_return += visit_all_entities_and_collect_futures(sub_entity, context) [Previous line repeated 1 more time] 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_ros/actions/node.py", line 453, in execute ret = super().execute(context) File "/opt/ros/foxy/lib/python3.8/site-packages/launch/actions/execute_process.py", line 823, in execute self.expand_substitutions(context) File "/opt/ros/foxy/lib/python3.8/site-packages/launch/actions/execute_process.py", line 668, in expand_substitutions cmd = [perform_substitutions(context, x) for x in self.cmd] File "/opt/ros/foxy/lib/python3.8/site-packages/launch/actions/execute_process.py", line 668, in cmd = [perform_substitutions(context, x) for x in self.__cmd] File "/opt/ros/foxy/lib/python3.8/site-packages/launch/utilities/perform_substitutions_impl.py", line 26, in perform_substitutions return ''.join([context.perform_substitution(sub) for sub in subs]) File "/opt/ros/foxy/lib/python3.8/site-packages/launch/utilities/perform_substitutions_impl.py", line 26, in return ''.join([context.perform_substitution(sub) for sub in subs]) File "/opt/ros/foxy/lib/python3.8/site-packages/launch/launch_context.py", line 232, in perform_substitution return substitution.perform(self) File "/opt/ros/foxy/lib/python3.8/site-packages/launch_ros/substitutions/executable_in_package.py", line 76, in perform package_prefix = super().perform(context) File "/opt/ros/foxy/lib/python3.8/site-packages/launch_ros/substitutions/find_package.py", line 79, in perform result = self.find(package) File "/opt/ros/foxy/lib/python3.8/site-packages/launch_ros/substitutions/find_package.py", line 96, in find return get_package_prefix(package_name) File "/opt/ros/foxy/lib/python3.8/site-packages/ament_index_python/packages.py", line 52, in get_package_prefix raise PackageNotFoundError( ament_index_python.packages.PackageNotFoundError: "package 'yolov8_ros' not found, searching: ['/opt/ros/foxy']"

Could you please help with this? At the same time when using the "ros2 launch yolov8_bringup yolov8.launch.py" statement did not produce any output except for an error (Package 'yolov8_bringup' not found: "package 'yolov8_bringup' not found, searching: ['/opt/ros/foxy']")

[mgonzs13]

Hi @arun-venkat-23, it seems you did not use colcon build followed by source ~/ros2_ws/install/setup.bash.

[arun-venkat-23]

I'm experiencing the same issue even after building the workspace and sourcing it.

[mgonzs13]

Which message are you getting when you source your workspace and launch the file in the same terminal? I the case of your previous message Package 'yolov8_bringup' not found: "package 'yolov8_bringup' not found, searching: ['/opt/ros/foxy']", I think you are not sourcing the workspace in the terminal where you try to run yolov8.launch.py.