There is no .fac file in workshop 4_2, so I don't know what you did and can not much help with that. But before you can trade a script anyway, you must understand it and must not be helpless when you make a mistake and get an error message.

First start with the simple scripts as in workshop 4. Learn how to test them, then trade them on a demo account. Then continue with the further workshops and more complex scripts. .fac files are introduced in workshop 6, it makes no sense to use them before.