How to solve javax.jcr.RepositoryException: Query contains more than one selector | AEM

Session session = resourceResolver.adaptTo(Session.class);
QueryManager queryManager = session.getWorkspace().getQueryManager();

String queryString = "SELECT child.*, page.[cq:lastReplicated] FROM [cq:PageContent] AS page "
              + "INNER JOIN [nt:unstructured] AS child ON ISCHILDNODE(child,page) "
              + "WHERE ISDESCENDANTNODE(page,'/content/geometrixx/en/') ";

Query query = queryManager.createQuery(queryString, Query.JCR_SQL2);
QueryResult result = query.execute();

NodeIterator nodes = result.getNodes();

javax.jcr.RepositoryException: Query contains more than one selector: [child, page]
 at org.apache.jackrabbit.oak.jcr.query.QueryResultImpl.getNodes(QueryResultImpl.java:161)

Query query = queryManager.createQuery(queryString, Query.JCR_SQL2);
QueryResult result = query.execute();

RowIterator rows = result.getRows();
while (rows.hasNext()) {
    Row row = rows.nextRow();
    Node node = row.getNode("page");
}