Problems in setting up IMP

[Tommaso Di Donato]

Hi!
I'm trying IMP, and I think it's fantastic. Everything seems to be working 
fine, except when I'm querying the db. I'm using horde 1.2.5, imp 2.2.5, 
postgreSQL 7.0.3-8 ang PHP 4.0.4.
For example, when I compose a new message I find these 2 warning in the top 
ov the page.

Warning: 5 is not a valid PostgreSQL link resource in 
/var/www/horde/imp/lib/db.pgsql on line 113
Warning: 7 is not a valid PostgreSQL link resource in 
/var/www/horde/imp/lib/db.pgsql on line 139

I think "5" and "7" are the row number of $result variable... I have the 
same problem in the address book...
Any idea about how to fix it?
Thax a lot!!

Tom