i find the problem
in the directory /var/www/html/modules/monitoring/libs y edit paloSantoMonitoring.class.php
search for "private function _rutaAbsolutaGrabacion($file)"
and change:
$basedir = DEFAULT_ASTERISK_RECORDING_BASEDIR.'/';
to
$basedir = '/var/spool/asterisk/monitor/';
and now looks like:
private function _rutaAbsolutaGrabacion($file)
{
$basedir = '/var/spool/asterisk/monitor/';
Restart http server and the recordings working good in the web admin