Scheduled refresh has been disabled.

Hi there. The dataset owner or a workspace admin (taking control of the dataset) can edit the credentials for the source.

They should get on the dataset configurations under "Data Source Credentials", then edit credentials. If you have a sharepoint connection configured directly to web, it should look like this but with a small icon of warning:

Introduce the correct credentials and run the refresh again.

I hope that helps,

You might need to get the PBIX from the report to modify the source because the error is saying that it can't find the excel file in that path at sharepoint. The file could have been moved or deleted and now the path doesn't make sense for Power Bi. 

If you know where the file is in sharepoint, I would suggest editing the PBIX file to change the data source (url). You could move also move the file to the path in sharepoint that power bi is reading but it might not work.

I hope that helps,