GitHub user dosubot[bot] added a comment to the discussion: Superset Dashboard & Chart Screenshot Not Found
<!-- Answer --> Your diagnosis is correct: the missing `geckodriver` is the root cause of both the screenshot/report failures and the “Not found” error when accessing the screenshot URL. Superset requires `geckodriver` (for Firefox) or `chromedriver` (for Chrome) to generate screenshots for dashboards and reports. If `geckodriver` is not installed or not in the system `PATH`, screenshot generation will fail, and the cache will not be populated—leading to the “Not found” error when you try to fetch the image via the API. This is confirmed by the error message you received and by the [official documentation](https://github.com/apache/superset/blob/c09f8f6f7665e503a376926700fa815add6892ca/docs/docs/configuration/alerts-reports.mdx). **How to fix:** 1. **Install `geckodriver` and Firefox** Make sure both are installed and that `geckodriver` is in your system `PATH`. For example, on Debian/Ubuntu: ```sh sudo apt-get update sudo apt-get install firefox-esr wget -q https://github.com/mozilla/geckodriver/releases/download/v0.34.0/geckodriver-v0.34.0-linux64.tar.gz tar -xzf geckodriver-v0.34.0-linux64.tar.gz sudo mv geckodriver /usr/local/bin/ sudo chmod +x /usr/local/bin/geckodriver ``` You can verify installation by running `geckodriver --version` and `firefox --headless`. 2. **Check your Superset configuration** In your `superset_config.py`, ensure: ```python WEBDRIVER_TYPE = "firefox" WEBDRIVER_OPTION_ARGS = ["--headless"] ``` If you prefer Chrome, install `chromedriver` and set `WEBDRIVER_TYPE = "chrome"`. 3. **Enable required feature flags and cache** Make sure these feature flags are enabled: ```python FEATURE_FLAGS = { "THUMBNAILS": True, "ENABLE_DASHBOARD_SCREENSHOT_ENDPOINTS": True, } ``` Also, ensure `THUMBNAIL_CACHE_CONFIG` is not set to `NullCache` and is properly configured for your environment (e.g., Redis, Memcached). 4. **Restart Superset and Celery workers** After making these changes, restart your Superset services and Celery workers to pick up the new configuration. **Why the “Not found” error happens:** When you request a screenshot, Superset triggers a background task (via Celery) to generate and cache the image. If the screenshot generation fails (for example, due to missing `geckodriver`), the cache is never populated, so the API returns a 404 “Not found” when you try to fetch the image. This is by design and is confirmed in the [code and documentation](https://github.com/apache/superset/blob/c09f8f6f7665e503a376926700fa815add6892ca/superset/dashboards/api.py). **References:** - [Superset Alerts & Reports configuration](https://github.com/apache/superset/blob/c09f8f6f7665e503a376926700fa815add6892ca/docs/docs/configuration/alerts-reports.mdx) - [Relevant code for screenshot caching and retrieval](https://github.com/apache/superset/blob/c09f8f6f7665e503a376926700fa815add6892ca/superset/dashboards/api.py) - [Discussion on similar issues and troubleshooting](https://github.com/apache/superset/discussions/31432) Once you have `geckodriver` installed and your configuration is correct, screenshot and report generation should work as expected. If you still see issues, check your Celery worker logs for any errors during screenshot generation. <!-- Dosu Comment Footer --> *To reply, just mention my name [@dosu](https://go.dosu.dev/dosubot).* --- <sup>How did I do? [Good](https://app.dosu.dev/response-feedback/8f8a5cd4-c66f-4099-8707-4db372fd9a5f?feedback_type=great_response) | [Irrelevant](https://app.dosu.dev/response-feedback/8f8a5cd4-c66f-4099-8707-4db372fd9a5f?feedback_type=irrelevant_answer) | [Incorrect](https://app.dosu.dev/response-feedback/8f8a5cd4-c66f-4099-8707-4db372fd9a5f?feedback_type=incorrect_sources) | [Verbose](https://app.dosu.dev/response-feedback/8f8a5cd4-c66f-4099-8707-4db372fd9a5f?feedback_type=too_verbose) | [Hallucination](https://app.dosu.dev/response-feedback/8f8a5cd4-c66f-4099-8707-4db372fd9a5f?feedback_type=hallucination) | [Report 🐛](https://app.dosu.dev/response-feedback/8f8a5cd4-c66f-4099-8707-4db372fd9a5f?feedback_type=bug_report) | [Other](https://app.dosu.dev/response-feedback/8f8a5cd4-c66f-4099-8707-4db372fd9a5f?feedback_type=other)</sup> [](https://go.dosu.dev/discord-bot) [](https://twitter.com/intent/tweet?text=%40dosu_ai%20helped%20me%20solve%20this%20issue!&url=https%3A//github.com/apache/superset/discussions/33660) GitHub link: https://github.com/apache/superset/discussions/33660#discussioncomment-13339497 ---- This is an automatically sent email for [email protected]. To unsubscribe, please send an email to: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
