Php – Debian webserver – Crontab error (not running php script)

I've a webserver with several sites and I'm trying to run a script by crontab but it gives me a error (126 and 127)

My script is in:

/var/www/site1/script.php

When I run the command:

php /var/www/site1/script.php

The script work as normal.

I've created a script.sh that contains

#!/bin/bash

/usr/local/php5/bin/php /var/www/site1/script.php

If I run

sh script.sh
Works

In crontab, I've entered this:

35 13 * * * /var/www/site1/script.sh

And I get this in syslog

Apr 12 13:35:01 webserver /USR/SBIN/CRON[13331]: (root) CMD (/var/www/site1/script.sh)

Apr 12 13:35:01 webserver /USR/SBIN/CRON[13330]: (CRON) error (grandchild #13331 failed with exit status 126)

What am I doing wrong?