Please look at the following error.
In order to use any excel methods, first you need to use Open component and pass the required information. Based on the error i can understand that there is no Open method used as Workbook is Null.
Thanks & Regards,
It shows that the workbook is null when using excel connector method SetCellValuesIfRowHas.
Unable to see the error from the screenshot provided. Can you please Copy and Paste the error directly?