[horde] I have a problem

[JANE]

I had install horde 2.2 and imp 3.1 and config all of the files that i =
know but it's not work when i login it occur a warning message like this


Warning: Undefined property: _iv in =
/var/www/html/mail/horde/lib/Cipher.php on line 89

Warning: Undefined property: _iv in =
/var/www/html/mail/horde/lib/Cipher.php on line 89

Warning: Undefined property: _iv in =
/var/www/html/mail/horde/lib/Cipher.php on line 107

Warning: Cannot add header information - headers already sent by (output =
started at /var/www/html/mail/horde/lib/Cipher.php:89) in =
/var/www/html/mail/horde/imp/redirect.php on line 84

Please help me fix this problem

JANE