Goal - scheduled wf to send email to AD group containing Dates and a formlink to a list form.  List has wf to route form through approvals, PDF it then route to final destination doclibs. 

current design:

The Site WF collects 2 date fields (I have these as start variables that are required - I have the Site WF to start manually) then send an email to an AD group. The email contains these date variables in the email, additionally a formlink to a listform. 

The site WF never kicks off, receives this error message: Coercion Failed: Unable to transform the input lookup data into the requested type.