Trouble with win32com and MS Project

[Felix Collins]

Hi,

I'm trying to assign a resource to a task in MS Project by using the 
example from MSDN for VB...


"Use the Add method to add an Assignment object to the Assignments 
collection. The following example adds a resource identified by the 
number of 212 as a new assignment for the specified task.

ActiveProject.Tasks(1).Assignments.Add ResourceID:=212"

My code fragment for Python...

proj.Tasks(3).Assignments.Add(ResourceID=2)

but this doesn't work.  I get...

Error (-2147352567, 'Exception occurred.', (0, None, 'The argument value 
is not valid.', 'D:\\Program Files\\Microsoft 
Office\\OFFICE11\\VBAPJ.CHM', 131074, -2146827187), None)


Anyone got any ideas about how to attack this?

Cheers,
Felix