B2BMA dataflow warning

Hi Team,

Please advise on how to sort out these warnings from B2BMA app dataflow?

" The dataflow was completed, but the augment_Account_User_EWCUA node didn't augment any columns. Either the node didn't find any matches, or a join key contains only null values. The dataflow was completed, but the augment_Contact_EWCUA node didn't augment any columns. Either the node didn't find any matches, or a join key contains only null values. The dataflow was completed, but the augment_Event_Account_EWCUA node didn't augment any columns. Either the node didn't find any matches, or a join key contains only null values. Data Sync isn’t scheduled for the SFDC_Local connection used in this job. Your data is only as up to date as the last manual sync. Schedule Data Sync from the Connect tab to make sure the job has the latest data. "

Thank you