Apierror-revisions-singlepage
titles, pageids or a generator was used to supply multiple pages, but the $1limit, $1startid, $1endid, $1dir=newer, $1user, $1excludeuser, $1start, and $1end parameters may only be used on a single page.
NATIONAL ETHNOGRAPHERS AND ANTHROPOLOGISTS. 20TH CENTURY
titles, pageids or a generator was used to supply multiple pages, but the $1limit, $1startid, $1endid, $1dir=newer, $1user, $1excludeuser, $1start, and $1end parameters may only be used on a single page.