How do I send list of dictionary from start process smart service to send email smart service which is another process model?

Hello,

I have a script task which retrieves first name and email id from the database as list of dictionaries. I want to pass it to the start process smart service as process parameters, so that it gets passed to send email smart service which is in another process model.

I had selected "Run one instance for each item in <process variable name which stores the list of dictionaries>" thinking that it would iterate through all dictionaries, but it didn't work. It gives the error : 

"Argument input to Start Process Smart Service must be a dictionary"
Thank you.

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