A generic error occurred whilst updating fields in Salesforce whilst importing audience member details from Emma. Check all the fields are mapped and are of the correct data type for creating or updating Salesforce leads or contact (i.e. don't map a string field to a number field in Salesforce). In particular check for any validation rules in Salesforce that would prevent the record from being saved. This can include restrictions on picklist values (i.e. the country name coming from Emma may not match the Salesforce countries).