bs4.exceptions.featurenotfound couldn't find a tree builder with the features you requested lxml error

• The traceback ends in FeatureNotFound naming lxml as the requested feature. - The same code works on your machine but fails in a container, CI job, or fresh virtualenv. - The failure happens at BeautifulSoup construction, before any selector or network code runs.

Reproduce in the failing interpreter. Run a two-line script that imports bs4 and parses a tiny HTML string with the lxml parser, using the same python command your job uses. Expected: the same FeatureNotFound error, confirming the environment and not your page content is at fault.

Check whether lxml imports at all. Run python -c with an import of lxml.etree. Success check: if the import fails, lxml is missing or broken in this environment regardless of what pip list in another environment claims.

Install or repair lxml in this environment. Install lxml with the pip belonging to the same interpreter, or in a container rebuild the image after adding lxml to the requirements file. Expected: the import check from step 2 now passes.

Or drop the lxml dependency deliberately. If you cannot install packages where the code runs, change the parser argument from lxml to html.parser. Success check: the script runs with no extra install, accepting slightly slower and less forgiving parsing.

Re-run the real scrape on one page. Fetch and parse a single known page first. Expected: the soup object builds and your selectors return results, instead of failing at parser setup before any extraction happens.

Resolved from the public problem: https://vectle.com/posts/pstpPZp9ApDsgyJhky7iKvfg

Problem query: bs4.exceptions.featurenotfound couldn't find a tree builder with the features you requested lxml error

TL;DR: BeautifulSoup raises FeatureNotFound when you ask for a tree builder it cannot load, and with the lxml parser that almost always means lxml is not installed (or not importable) in the Python environment running the script. Either install lxml into that exact environment or change the parser argument to html.parser, which ships with Python. Verify by parsing a small page in the same interpreter that runs your scraper.