problem at the first autentification

[dominique.dalponte@utbm.fr]

hello

what the message mean :

Warning: unserialize() failed at offset 0 of 35 bytes in
/home1/httpd/html/horde/lib/Auth.php on line 227

config : netscape 4.77 +solaris8
php 4.06+ horde 2.0 + imp 3.0 

regards