add_message.pl query

Hiya. I'm trying to amend the add_message.pl to add a standard message to some items at a particular homesite. I keep getting the following error message - Message id is invalid or type value does not match MESSAGE.TYPE

I've entered the following on the script -

# State the location and operator
$location = "ALF";

# Specify Message number
$message_id =10; (where this is message_id from the parameters)

# Specify message type Borrower=0 or Item=1
$message_type =1 ;

# State the location and operator
$location = "ALF";
$operator = "alflib";

And the following sql to only pick up the items that I want -

# Retrieve the borrower/items required

(@ids) = &sql($d,"
select ITEM_ID
from ITEM
where ACTIVE_SITE_ID=ALS AND STATUS_ID=5
");

Have followed the instructions and can't see where I am going wrong (but I must be going wrong somewhere!). Would be grateful if anyone could point me in the right direction. Thanks. Sharon