Trying to save back up of database in windows and xampp

mysqldump.exe --user=root--password=passroot--host=localhost --port=3306 --result-file="C:\xampp\htdocs\Demo\backup.%date:~10,4%%date:~7,2%%date:~4,2%.sql" --default-character-set=utf8 --single-transaction=TRUE --databases "dbname"

This is how I did my back up of database in task scheduler. What I did is I set this in action but i get the error.

The system cannot find the specified file. (0x80070002)

What is the correct way to do task scheduler that will backup the database in xxammp