Add enable_extension tip to Troubleshooting

[Tadinu]

For beginners, typically trying to figure out why a module is not found as running a script, whilst it is clearly installed (shown by pip show) may be hard.
Would it be possible to add the tip mentioned here into Troubleshooting or Known Issues?
Thanks!

[vick-yu]

That's an excellent suggestion! Just to confirm, are you referring to the ModuleNotFoundError in Python?

If so, could you share more about your experience with resolving it? Understanding your specific use case would help us determine the best way to integrate this tip into the documentation.

[Tadinu]

@vick-yu Yes I am, It's natural that not all isaacsim packages/extensions should be auto-enabled by default.
So the error appears eg if we put these at https://github.com/isaac-sim/IsaacLab/blob/main/scripts/demos/arms.py#L39

import isaacsim.robot.manipulators
import isaacsim.robot_motion.motion_generation

[vick-yu]

The Isaac Sim documentation does have information on this, but it's spread across a couple of different sections. We have details on enabling additional extensions for standalone Python scripts, as well as a page on updating extensions.