Automatic update

Hello,

I'd like to ask for your help. I have a problem with automatic update of PowerBi, the source for my data is MES database.

"The scheduled update is inactive because at least one data source is missing login credentials. To restart the update, go to the settings page for this dataset and enter the login credentials for all data sources. Then reactivate the scheduled update."

Do you have any experience with this, how can I fix it so I can update the file automatically?

Thank you

Barbora