[ExceptionErrorShortName]=GatewayClientErrorResponseException[GatewayId=270057]'. RootActivityId =

Codingwithvikas ,The error GatewayClientErrorResponseException[GatewayId=270057] in Power BI typically indicates an issue with the data gateway used to refresh the dataset.

Please try below steps 

Ensure that the on-premises data gateway is running and connected. You can do this by going to the Power BI Service, navigating to the "Manage Gateways" section, and checking the status of the gateway.

Make sure that the data gateway is up to date. Sometimes, updating the gateway to the latest version can resolve connectivity issues.

Verify that there are no network issues or firewall settings blocking the gateway from accessing the data source.

Data Source Credentials: Ensure that the credentials for the data source are correct and have not expired. You can update the credentials in the Power BI Service under the dataset settings.

Resource Availability: Check if the data source is available and not under maintenance or experiencing downtime during the scheduled refresh times.