APPIAN RPA open macro file Error

Hi all,

I am trying to make a small robot that downloads an excel file from Appian and uses a macro template to apply formatting to the downloaded file.
Using the Open excel workbook action on the downloaded file everything works. When I use the same action to open an xlsm file, that is, the file with the macro, I get this error which I attach.
I thank in advance those who will help me solve the error.
Best regards,
Marco Pennacchia