X_SCRAPE_SELECTOR_MISSING
Means
the selector never appeared inside its window
Typical cause
terminal — the page changed. The markup this scraper was written against is not what the site served. Deliberately distinct from X_SCRAPE_NOT_ACTIONABLE: nothing matched at all, so no wait and no retry can produce one
Fix
open the run's page.html artifact and re-derive the selector, or raise the timeout on this waitFor({ timeout })