[imp] getprovider() error configuring IMP

[Marcos Monge]

Hi Everybody

I'm using latest snapshot of horde and imp (no RELENG version).

Installing horde without problem, and install IMP.

When trying to configure IMP using the Horde 
Administration/Configuration tool, I have the folowing Error:

Warning: Undefined index: alternate_login in 
/var/www/html/horde/imp/login.php on line 95
Fatal error: Call to undefined function: getprovider() in 
/var/www/html/horde/imp/login.php on line 104


Before this, I have defined the following in /horde/config/horde.php:

$conf['auth']['driver'] = 'imap';
$conf['auth']['admins'] = 'marcos';
$conf['auth']['params'] = array();
$conf['auth']['params']['dsn'] = '{imap.mydomain.com:143/imap/notls}INBOX';

Note: the $conf['auth']['admins'] = 'marcos'; is not explained in any 
place of the file or doc in this version. I have found this in the 
mailing list, for previous versions of horde, where it's explained in 
conf.php.

When 'imp' module is "inactive" in registry.php, I can login with user 
'marcos' and see "options", but nothing about administration.

When 'imp' module is "active" in registry.php, after login with user 
marcos, I see the options link (but without  the icon graphics, that 
reference to /horde/imp/graphics/prefs.gif, instead of 
/horde/graphics/prfefs.gif). If I click in Options, I get the error:

Warning: Undefined index: alternate_login in 
/var/www/html/horde/imp/login.php on line 95
Fatal error: Call to undefined function: getprovider() in 
/var/www/html/horde/imp/login.php on line

I have search "getprovider" in all the horde/imp source, and don't found 
in any place.

Any help?

Thanks in advance