# Error on loading ros2\_bridge extension through standalone python script

**URL:** <https://forums.developer.nvidia.com/t/error-on-loading-ros2-bridge-extension-through-standalone-python-script/245568>\
**Category:** Isaac Sim\
**Created:** [March 9, 2023, 7:15pm UTC](https://forums.developer.nvidia.com/t/error-on-loading-ros2-bridge-extension-through-standalone-python-script/245568 "2023-03-09T19:15:49Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![oadonca](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@oadonca](https://forums.developer.nvidia.com/u/oadonca)\
**Post date:** [March 9, 2023, 7:15pm UTC](https://forums.developer.nvidia.com/t/error-on-loading-ros2-bridge-extension-through-standalone-python-script/245568/1 "2023-03-09T19:15:49Z")

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I am running ROS 2 Foxy with Ubuntu 20.04 and Isaac Sim 2022.2.0. When trying to run the moveit standalone python script, the simulator loads successfully until the ros2\_bridge extension is loaded. At which point I receive the following error and the simulator terminates: `[ERROR] [1678388989.647593453] [rcl]: Error getting RMW implementation identifier / RMW implementation not installed (expected identifier of 'rmw_fastrtps_cpp'), with error message 'failed to find shared library 'rmw_fastrtps_cpp', at /workspace/foxy_ws/src/rmw_implementation/rmw_implementation/src/functions.cpp:75', exiting with 1., at /workspace/foxy_ws/src/rcl/rcl/src/rcl/rmw_implementation_identifier_check.c:145`.

I do not get this error when I load the ros2\_bridge extension manually through the extension windows inside Isaac Sim. The command I am running is `./python.sh standalone_examples/api/omni.isaac.ros2_bridge/moveit.py` from the isaac\_sim-2022.2.0 root directory. I have made sure not to source ROS in the terminal and have confirmed that my RMW\_IMPLEMENTATION and FASTRTPS\_DEFAULT\_PROFILES\_FILE are set according to the tutorials.

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**Author:** ![rchadha](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/rchadha/32/185034_2.png) [@rchadha](https://forums.developer.nvidia.com/u/rchadha)\
**Post date:** [April 18, 2023, 6:28pm UTC](https://forums.developer.nvidia.com/t/error-on-loading-ros2-bridge-extension-through-standalone-python-script/245568/4 "2023-04-18T18:28:07Z")

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Hi @oadonca , just want to confirm that the ROS installation/workspace is not being sourced before running the Python script. Do your ros topics show up when you run Isaac Sim with a ROS2 example (navigation)? (a `ros2 topic list` gives the active topics after you hit play in sim?) If the topics don’t show up, try going through `UNSET_LD_LIBRARY_PATH` and `fastdds.xml` steps in the ROS2 installation before running the Python Script again. If that does not help, please provide a repro with the exact steps so we can help.