[horde] Installation problem - phptype !!

[John Smith]

I have installed Horde and tried to run it - but get the following message:

A fatal error has occurred:

Required 'phptype' not specified in authentication configuration.

[line 96 of /home/john/public_html/horde/lib/Auth/sql.php]

Details have been logged for the administrator.

--- within my horde.php file i have

$conf['prefs']['driver'] = 'sql';

$conf['prefs']['params']['phptype'] = 'mysql';
$conf['prefs']['params']['hostspec'] = 'localhost';
$conf['prefs']['params']['username'] = 'horde';
$conf['prefs']['params']['password'] = '*****';
$conf['prefs']['params']['database'] = 'hordedb';
$conf['prefs']['params']['table'] = 'horde_prefs';

and the same further down the page -- but i still get the same errors.

Any pointers?!

Thank you for any reply.
Cheers,
J.