E-mail Message body in html format

using the "Send email with new data" action, I would like that the message body will be in html format.

In the past you instructed me to change in include/commonfunctions.asp file :
myMail.Body = message

to

myMail.HTMLBody = message
And
myMail.TextBody= message

to

myMail.HTMLBody = message
After I made the changes and when e-mail suppose to be sent, I get the error message:

Error number: 438

Error description: Object doesn't support this property or method
On July 2006, it didn't work for me and I received similar message. When I tried it after you launched ASPRunnerPro 4.1 at the end of October - it worked for me. Now, After I upgraded to build 174 - it doesn't work for me again.
What is the problem and what is the solution?
Thanks