Template workflow issue

I m excuting the send approval request (button) and I m getting the following error message :
This record is not supported by related approval workflow .
What could cause this problem ?
I already create and enabled the approval workflow from a template and set up smtp mail server and job queue and notification .

Hi Rodd,
I gave you an answer to this question here:

The suggestion stands, you’re better off starting with a copy of one of the standard workflows, and work your way from that, then debugging the new you created.