Unfortunately i get the same error message than before.....
code in program/lib/Roundcube/rcube_imap.php is now:
public function index_direct($folder, $sort_field = null, $sort_order = null, $search = null)
{
if (!empty($search)) {
// $search = $this->search_set->get_compressed();
$search = $search->get_compressed();
}
Regards