Error: "Argument 1 passed to Piwik\DataTable\Row::setSubtable() must be an instance of Piwik\DataTable, instance of Piwik\DataTable\Map given, called in /plugins/Referrers/DataTable/Filter/SetGetReferrerTypeSubtables.php on line 85","file":"/core/DataTable/Row.php","line":304

URL
?module=API&method=Referrers.getAll&idSite=all&period=day&date=2018-09-16&format=XML&filter_limit=20&token_auth=XYZ

No POST params