Power Query Error when importing Excel files after formatting a table area in excel

Hi synaptical 

This issue occurs because when you converted your Excel range into a formatted table, Power BI no longer recognized the old column structure it was originally mapped to. In your query, Power BI is still looking for a placeholder field like Column1, but now the actual table header is Title, which causes the error. You don’t need to rebuild your whole transformation; instead, open the Power Query Editor and adjust the step where the error appears (usually “Promoted Headers” or “Changed Type”) by replacing Column1 with Title. If you are combining multiple files from a folder, make sure the sample file query is corrected, as Power BI applies those steps to all files. Going forward, keep header names consistent in your Excel templates, and in Power Query use the “Choose Columns” step with the dynamic option enabled so that missing optional columns don’t break refreshes. This way, you only fix the column reference once, and all future files will load smoothly without recreating your transformations.