Encountering SyntaxError message when running the last command from the instruction

[hinlawrtai]

After following the instruction, and when I type the last command "python app.py", it generates the following error:
SyntaxError: Non-UTF-8 code starting with '\xe0' in file C:\Users\hinla\Downloads\PDF2Audio\app.py on line 370, but no encoding declared; see https://python.org/dev/peps/pep-0263/ for details

Thank you.

[aymiee]

I came across this same error and placed the above before all lines and it appears to be working:
# -*- coding: utf-8 -*-

[Miu-u]

I came across this same error and placed the above before all lines and it appears to be working: # -*- coding: utf-8 -*-

I use it in app.py file, but it doesn't work. It generates the following error:
Traceback (most recent call last):
File "C:\Users\newga\PDF2Audio\app.py", line 877, in
gr.Markdown(read_readme())
File "C:\Users\newga\PDF2Audio\app.py", line 26, in read_readme
content = file.read()
UnicodeDecodeError: 'gbk' codec can't decode byte 0xa4 in position 2608: illegal multibyte sequence