missing link between toolbox and tool (python)

Question

I want to run a arcscript to do batch work.

However, the error always showed that environment or tool not found. (gp.SplitByAttribute(inputFC, fieldName, outputWS, filePrefix) AttributeError: Object: Tool or environment not found)

Please kindly help with the following code.

Since any attachment is not allowed, please kindly advise if it is possible to send the arcscript somwhere. Thank you. System: ArcGIS 9.3 Windows Vista

##Script Name: split rows
##Description: using 
##Created By: Elaine Kuo
##Date: 23/09/2012


#Import standard library modules
 import arcgisscripting
 import os

#Create the Geoprocessor object
 gp = arcgisscripting.create(9.3)


#Set the workspace.
 gp.Workspace= "H:/temp/test1"


#Set the workspace. List all of the feature classes in the dataset
 outWorkspace= "H:/temp/test1"

 inputFC = "H:/temp/test1/geor0247_Dissolve.shp"
 fieldName = "C0247"
 outputWS = "H:/temp/test1"
 filePrefix = "geor0427"


 # Add a toolbox with a model to the geoprocessor and set the workspace
  gp.AddToolbox("C:/TEMP/AdditionalAnalysis/Additional Analysis - Generic Tools.tbx")



 #### Execute Script Tool ###
  gp.SplitByAttribute(inputFC, fieldName, outputWS, filePrefix)


  gp.AddMessage(gp.GetMessages())
  print gp.GetMessages()