Errors While creating an Email Activity?

Hi Experts,

I am creating an Email Activity with the type code "39" in the Before Save script file of Activity while saving the Activity Task(TypeCode: 542).

But i am getting the following errors with the standard code which sap has given in the repository explorer for Email Activity Creation..!!

these are the errors:

Please enter a process type.

Save failed. Technical error due to object ID not determined. Please report an incident.

Identity is invalid or could not be determined. Please check.

Date is invalid or could not be determined. Please check.

Save failed..

Why is that i am getting these errors?? i used the code which is there in the 1402 repository explorer..

Thanks,

Mani