How to Resolve FileNotFoundError

I'm a beginner who started studying python recently.
I read and write csv and xlsx files.
In the process, when I entered the code below in the book, a FileNotFoundError appeared.
The csv file exists because it is a self-made file for practice.

import csv
with open("book1.csv") as file:
    rows=csv.reader(file)
    For row in rows:
        print(row)

FileNotFoundError appears now.
Please let me know.