are you sure that there’s at least one call created for the Mockdata REST connector yet. The data source dialog will list you all connector calls existing for a given connector which have at least one output parameter of a collection type. So it might be the case that your output parameter does not have a proper collection set as data type yet. Can you please check on that and if needed create a new one via the connector test function? Simply execute the connector call there and then click on the button named ‘Use scheme for output’. This procedure should also be shown in the lesson mentioned by you so please go over the video again and listen carefully as to verify that every action needed has been carried out by you as intended.
