my reports in a created workspace, is it refresh-able ? ... i uploaded all my files ( pbi.xfile & excel sheets data set ) on one drive for business .. and when i clicked on refresh icon beside datasets icons it gives me error ......

Hi Marina, This is because Power BI requires a gateway between your machine and Power BI service. The gateway can be downloaded and configured from here: https://docs.microsoft.com/en-us/power-bi/connect-data/service-gateway-onprem

Follow this topic