How to Read a Property called "due date"

Question

I want to create a AppleScript that reads the to dos in the Today list of Things and display a Growl message which works but then I wanted to put into the title the due date. In the the 'Open Dictionary" for Things' To Do class there is a property called 'due date'. But when I try to read it out I cannot compile the script:
set taskDueDate to due date of taskItem
I get this dialog box error:
Syntax Error: Expected end of line, etc. but found class name.
and the cursor ends up on the 'date' token.
Any idea how to access that property?
Thanks - Andy

Answer 1

I added this line but it did not work for me either.
Here is the entire script (which I have taken from the Things wiki):
-- Checks to see if GrowlHelperApp is running, then registers this script with Growl
tell application "System Events"
if application process "GrowlHelperApp" exists then
tell application "GrowlHelperApp" to register as application "Things" all notifications {"Reminder"} default notifications {"Reminder"} icon of application "Things"
end if
end tell
tell application "System Events"
if application process "Things" exists then
tell application "Things"
set todayTasksCount to (count to do of list "Today")
set todayTasks to to dos of list "Today"
end tell
if todayTasksCount is greater than 0 then
set fullTaskName to ""
set fullTaskTitle to ""
repeat with taskItem in todayTasks
set taskName to name of taskItem
set fullTaskName to fullTaskName & "; " & taskName
set taskDueDate to current date
-- get due date of to do 1
set taskDueDate to due date of taskItem
set fullTaskTitle to "Reminder: " & taskDueDate
-- tell application "GrowlHelperApp" to notify with name "Reminder" title "Reminder" description taskName application name "Things" icon of application "Things"
tell application "GrowlHelperApp" to notify with name "Reminder" title fullTaskTitle description taskName application name "Things" icon of application "Things"
end repeat
end if
end if
end tell
Let me know if you have any ideas.
BTW I use AppleScript Editor 2.3 (118) and AppleScript 2.1.2.