Tutorial not working

I am watching Mosh’s Python tutorial - Pythoon full course for beginners.
in the chapter at [03:55:34] Project 1: Automation with Python, i’ve done everything he sais and shows but i still get this error message

What am i doing wrong?

Is the file ‘transactions.xslx’ in the same folder as ‘main.py’? The traceback is saying that it can’t find that file.