My PBI web Service auto refresh get error.

Hi All

Out of sudden i get email notification , that refresh error.

Before i received this email notification, when i open my PBI file from PBI Desktop , when i refrest i also get below error :-

Since all my data is at sharepoint :-

I think the issue should not be cause by my PBI file setting issue , because PBI web service also have issue on error when refresh data. 

Can some one suggest to me where go wrong ?

I just found out that some of the folder from sharepoint missing , May i know how to go about troubleshoot ? i mean how do i know PBI load which raw data first ? 

Paul