Duplicate content
What it means
These pages have identical text. Search engines pick one and discard the rest, and the choice is theirs, not yours.
How to fix it
Consolidate: keep the best version, 301 the others to it, or canonicalise them to it if they must stay reachable. Where duplication is built into the site (a printer friendly copy, the same product under two categories), a canonical to the primary URL is the right fix. Where it is thin templated text, write real content or remove the pages.
Finding it in CrawlStat
After a crawl, open Issues and pick Duplicate content. Click Show all in Pages to filter the Pages table to the affected pages, or Export affected to hand the list to whoever owns the fix. Audit ID: duplicate_content.