already existing target excel file issue

I have explained the issue in word file attached below, Basic lly I just tried simple mapping but the tool gives me error to write in destination file

Hello

In the file attached, I can only see two excel file and no word documents.

Please find the attached word file

Thank you,
We will have a look at it for you

Please look at the output excel file, I am just trying to paste data on sheet 3 which is unprotected,
Testing whether this tool supports for already existing target excel file or not? and keep the format of target file as it is

Can you try removing dot from sheet names