Can't Mass Email

[YummyArticles]

Hey guys, I found your forum after noticing the Article Dashboard site was down I searched around and found this. I and I'm sure many other appreciate you setting this up to help us out! Anyhoo, I've had my script set up for a while without any problems now I want to send out a mass email to all my members. I prepared the email had everything ready, was all excited, hit send and boom, I get this message:

Users: 12227Class Mail: error, From is not a string

Unfortunately, my coding expertise only stretches through XHTML/CSS so anything PHP/Database related usually flies over my head unless it's blatantly obvious. I checked my email address and asked a few members and they didn't have anything so it's clearly not just surface problem. If you know any fixes, I'd love to know. I'm positive emailing all my 12518 members will help my traffic!

Thanks