---
updatedAt: 2025-11-11T01:51:19.000Z
agentTools:
  projectIndex: https://docs.formant.io/llms.txt
---

# I don't see ROS data in Formant

# Issue details

* Sometimes I need to restart Formant agent to make it publish data

# Troubleshooting steps

* [Check agent logs](https://docs.formant.io/docs/getting-started-install-the-formant-agent#retrieving-agent-logs)

### Check that the catkin workspace is sourced correctly

If you see:

```
WARN        ROS bridge: python3        Cannot subscribe to <Stream> with type <customMessage>; no message found. catkin workspace may be unsourced.
```

* Check the agent logs right after a reboot, do you see it source your custom workspace? If not, make sure\
  `$SOURCE_SCRIPT` or `$CATKIN_WS` are set correctly in `/var/lib/formant/.bashrc`. See [Environment variables for the agent](https://docs.formant.io/docs/environment-variables-for-the-agent#ros-environment-variables) for more information.

# See also

* [Install the Formant agent](https://docs.formant.io/docs/getting-started-install-the-formant-agent)
* [Environment variables for the agent](https://docs.formant.io/docs/environment-variables-for-the-agent)

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