Runtime error on SendMail

Hello!

I am constantly getting the Runtime error when running this short python script in TestComplete:

def sendResults():
   SendMail("xxx@gmail.com", "mail.xxx.com", "Test Execute", "xxx@gmail.com", "Test", "Hello", "C:\Test-results\test.txt")

Any suggestions?

TestComplete V: 11.20

OS: Windows 7 Enterprise

Attached is the screenshot of the error message.