I use "PHP" exec function Run rsync, But error......

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Hi!
I use "PHP" exec function Run rsync

<?
exec("/usr/bin/rsync -azrvlHpogDtS --delete --progress --password-
file=/root/rsyncd_db.secrets /home/bruce db at 192.168.1.200::brucebackup");
?>

but run error

error message: @ERROR: auth failed on module brucebackup

but login linux run form command 

"/usr/bin/rsync -azrvlHpogDtS --delete --progress --password-
file=/root/rsyncd_db.secrets /home/bruce db at 192.168.1.200::brucebackup"

It is ok....

So... How about to solve problems

Thanks!