3161004 - I am not receiving emails from my approval workflow

My approval workflow sends an email to the case creator if the approval workflow is triggered. I am not receiving an email, when I trigger the approval workflow.

Please check whether you have a license in the workflow accelerator. If you have no workflow accelerator license and trigger an approval workflow for which contains the case creator (e.g. case-creator-email) the field will be left blank and no email is sent.

KBA , BPI-SIG-CA-AWF , Approval Workflow for SAP Signavio , How To

SAP Signavio Process Manager all versions ; Signavio Process Manager all versions