[imp] Undefined index: use_vfs

[Michael Sogos]

when i add an attach in compose window, the page refresh and on the top i can see this message:
 
Notice: Undefined index: use_vfs in C:\www\webmail.8group.it\path\to\imp\compose.php on line 1031
 
what does it means ?
this error do nothing because i can send mail with attachements
 
i have horde 2.2 and imp 3.2.2 with php 4.3.1
 
thanks
-------------------------------------------
Michael Sogos
m.sogos at 8ware.it
 
8group
8ware srl - IT Consulting
BERGAMO - via Bono 11/C - tel. 035 233952 / fax 035 231154
MILANO - via Simone D'Orsenigo, 21 - tel. e fax 02 55.186.531
http://www.8ware.it <http://www.8ware.it/>