I am trying to set dialog in dynamic participant step. I assigned participant dynamically and chose dialog path but it is giving me this error when I try to complete action assigned.

I followed steps of 'DIALOG PARTICIPANT STEP - TOUCH-OPTIMIZED UI' from https://helpx.adobe.com/ca/experience-manager/6-3/sites/developing/using/workflows-step-ref.html#Par... but still getting this error. The structure of the dialog looks like this. 

The path to dialog I am providing is '/etc/workflow/dialogs/DateTimePicker'. As per the error, I assume that I need to have touchUiDialogPath somewhere in the new DateTimePicker component. If yes, where should I add and what should be the value for the touchUiDialogPath? I want to provide datepicker from granite/ui/components/coral/foundation/form/datepicker. If I directly add 'granite/ui/components/coral/foundation/form/datepicker' path in dialog path of the dynamic participant step, I see same error.