Issue with Mass-Mailer-toolkit

[dophubao]

I put "smtps.txt" file in the same folder with "smtpchecker.py"and my SMTP servers format as "password:login:host:port" but I got this error, could you help me fix it ?
I'm not familiar with Python

Usage: smtpchecker.py smtps.txt Traceback (most recent call last): File "C:\asd\smtpchecker.py" , line 23, in <module> with open(sys.argv[1],'r') as sm IndexError: list index out of range