public function validateAddMemberWikiplaceID($id, $allData)
 {
     if (!is_string($id) || !preg_match('/^[1-9]{1}[0-9]{0,9}$/', $id)) {
         return 'Error: Invalid Wikiplace ID';
     }
     $wikiplace = $this->checkWikiPlace(intval($id));
     if (is_null($wikiplace)) {
         return 'Error: Invalid Wikiplace';
     }
     if (WpMember::CountMembers($wikiplace) >= WP_MEMBERS_LIMIT) {
         return wfMessage('wp-members-limit-reached');
     }
     return true;
     // all ok
 }