TypeError: coercing to Unicode: need string or buffer, NoneType found (PyPhisher)

I'm running Ubuntu 18.04.

I cloned PyPhisher from GitHub -

git clone 

then I ran PyPhisher.py file by executing -

python PyPhisher.py

So I got this output -

Traceback (most recent call last): File "PyPhisher.py", line 79, in main(args) File "PyPhisher.py", line 17, in main pish(args) File "PyPhisher.py", line 20, in pish message_html = open_html_file(args.html) File "PyPhisher.py", line 26, in open_html_file with open(file, 'r') as open_html: TypeError: coercing to Unicode: need string or buffer, NoneType found

Can someone fix this?

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