Required Fields are Missing
Salesforce objects in the connector have fields that are required. If the required fields are not mapped when the connector runs, it will give this error.
To find out which fields are required, go to the Go to... menu at the top right of the connector of the connector and click Salesforce Object Reference.
The required field rows will say Required in the far right column.
To map the required fields in the connector, click "Map Another Field" within the object and choose the field that is required to be mapped by Salesforce.