[imp] compose button does not working

[comertoglu at itu.edu.tr]

Hi all,

i have problem with imp 4.3 . when i upgrade from 4.2 to 4.3  compose  
button in sidebar does not working. there are "PHP Fatal error:  Call  
to undefined method IMP_Compose::attachVCard() in  
/var/www/html/webmail/horde/imp/compose.php on line 165," lines in  
error log.

i closed that line and then it worked. what is attachVCard() stands for??
did i make a mistake by closing that line?

Thanks,