[horde] Error in sql.php (Kronolith)

[Brenda Bell]

I'm inching my way through my install of Horde applications.  I have a 
working Horde, IMP and Turba... and am now trying to install Kronolith.

I'm using SQL and have configured Kronolith by changing the driver as 
follows:

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

And uncommenting the following -- making changes as appropriate for my 
environment:

$conf['calendar']['params']['phptype'] = 'mysql';
$conf['calendar']['params']['hostspec'] = 'localhost';
$conf['calendar']['params']['username'] = 'entered-real-username-here';
$conf['calendar']['params']['password'] = 'entered-real-password-here';
$conf['calendar']['params']['database'] = 'horde';
$conf['calendar']['params']['table'] = 'kronolith_events';

I've also created the database table and registered Kronolith with 
Horde.  Until I know my way around, I am not changing any files other 
than the minimum to get the applications running.

Shortly after I press the Log In button on the login page, I get the 
following error:

Fatal error: Call to undefined function: iswarning() in 
/fs4/www/horde/horde/kronolith/lib/Driver/sql.php on line 64

I know mysql is working to some extent because I've been able to add 
Turba contacts without any errors.

I would appreciate help in figuring out what I've done wrong.

Also, I'm trying to provide all of the information necessary to helping 
me solve the problem, but I'm new to Horde so I'm still guessing at 
what's important :(  Please let me know if I can provide more info.

Brenda
http://opensource.theotherbell.com