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While saving an problematic excel file, if any exception occurs need to throw the proper exception details to the client side to know where the issue exactly occurs.
For example, if an exception occurs while processing the named ranges on saving the file, then we need to send the proper exception details to the client-side like "Not able to process the named range" along with the named range details.
Below attached the exception throws JSON with client side sample,
Sample link: Sample link
Run the above sample by connecting with the local service and try to save the Spreadsheet data as excel and the below exception will occur,

