Troubleshooting¶

Install¶

Symptom	Likely cause	Fix
`ModuleNotFoundError: mujoco`	Missing `[sim-mujoco]`	`uv pip install "strands-robots[sim-mujoco]"`
`ModuleNotFoundError: lerobot`	Missing `[lerobot]`	`uv pip install "strands-robots[lerobot]"`
`ImportError: cannot import name '...' from 'lerobot'`	LeRobot version skew	`uv pip install "lerobot>=0.5.0,<0.6"`
`ImportError: cannot import name 'MolmoAct2Policy'`	MolmoAct2 not in PyPI lerobot (added post-0.5.1)	Install from source: `uv pip install "lerobot[feetech] @ git+https://github.com/huggingface/lerobot.git"`
pyav build fails on Jetson/aarch64	No prebuilt wheel for sm_110	Use `--no-build-isolation` or install `torchcodec>=0.7` and skip pyav. See installation
numpy ABI mismatch on Jetson	System pandas vs pip numpy	`uv pip install "numpy<2" "pandas==2.1.4"` then reinstall
`uv pip install -e .` errors	Wrong cwd	`cd` to repo root first

Symptom	Likely cause	Fix
`GLXBadFBConfig` (Linux)	Missing OSMesa	`sudo apt install libosmesa6-dev` + `export MUJOCO_GL=osmesa`
Black frames from `render(...)`	Headless, no GL backend	`export MUJOCO_GL=osmesa` (Linux) or `=egl`
`Robot("foo")` raises ValueError	Unknown name	Check `list_robots("all")`; or pass `urdf_path=...`
Sim hangs on `create_world`	Asset download	Wait - first call downloads MJCF, then cached
`ModuleNotFoundError: trs_so_arm100_mj_description`	Auto-install failed	`uv pip install trs-so-arm100-mj-description`
`add_robot` raises after `load_scene`	Scene XML overrides world	Use `add_robot` before `load_scene`

Symptom	Likely cause	Fix
`PermissionError: /dev/ttyUSB0`	Not in `dialout` group	`sudo usermod -aG dialout $USER` + re-login
Arm twitches at startup	Stale calibration	Re-run `lerobot_calibrate`
Camera frames black	Wrong `index_or_path`	`lerobot_camera(action="list")`
Servo error mid-rollout	Velocity limit	Bump `control_frequency` or relax calibration limits
`Robot("so100", mode="real")` raises	Calibration missing	Run `lerobot_calibrate` first
Real robot moves wrong way	Joint mapping mismatch	Verify `data_config` matches recording

Symptom	Likely cause	Fix
`UntrustedRemoteCodeError`	`lerobot_local` needs HF exec	`export STRANDS_TRUST_REMOTE_CODE=1`
`Gr00tPolicy` connection refused	Container not running	`gr00t_inference(action="start_container", ...)`
`Gr00tPolicy` returns garbage	`data_config` mismatch	Use same `data_config` as training
`Cosmos3Policy` connection refused	Service not running	`uv pip install 'strands-robots[cosmos3-service]'` + start server
Policy import slow	Heavy dep at module top	Defer to `__init__` or `get_actions`

Symptom	Likely cause	Fix
`start_recording` fails: lerobot missing	`[lerobot]` not installed	`uv pip install "strands-robots[lerobot]"`
Need MP4 without LeRobot	-	Use `start_cameras_recording` / `stop_cameras_recording`
Empty MP4 files	Stopped before any frames	Check `get_recording_status()` frame count
Push fails	Not logged into HF	`huggingface-cli login`

Symptom	Likely cause	Fix
`mesh.peers` empty	Other peer not running	Wait ~1s; verify `mesh.alive == True` on both
Port already bound	Another zenoh process	Mesh auto falls back to client mode; or set `STRANDS_MESH_PORT`
`init_mesh` raises	`eclipse-zenoh` missing	`uv pip install "strands-robots[mesh]"`
Want mesh off	-	`STRANDS_MESH=false` or `Robot(..., mesh=False)`

Symptom	Likely cause	Fix
Agent picks wrong action	Tool spec confusion	Rephrase instruction; check `robot.tool_spec`
`Agent(tools=[robot])` errors	`strands-agents` missing	`uv pip install strands-agents`
Agent hangs	Long-running action	Use `start_policy` instead of `run_policy`
Bedrock/Anthropic auth fails	Provider credentials	See Strands Agents docs

Bug reports: GitHub issues - include pip show strands-robots, Python + OS, minimal repro, full stack trace.