Task Sequence Environment not available

Problem:
Your deploying a Script which shell use Task Sequence Variables with SCCM.
There seems to be a problem when creating the object for the Task Sequence Environment CreateObject("Microsoft.SMS.TSEnvironment").
You may also get the following error: Error 429 - ActiveX component can't create object.

Solution:
Make sure that your really running the script within a Task Sequence. Also check that you have created a Task Sequence Advertisement (Advertise Task Sequence).