Precisation on precedent e-mail ( error Compose.php3 )

[Alessandro Coppelli]

 When I try to attach file to obtain

 this message :

 warning: Unable to open '/tmp/phpXXXXX
for reading : No such file or directory in
 /where/my_apache_is/htdocs/horde/imp/compose.php3
 on line 916 .

 What it mean ?

 Alessandro