Someone thinks you're not very good at email.
They've sent you this link for one of the following reasons:
- They think you'll be too embarrassed if they said something to you directly.
- You've done the same silly thing more than once.
- They simply cannot be bothered with dealing with stupid people who refuse to learn how to communicate.
It's the 21st century. Email has been around for a little while now. It's a mandatory communication tool. It's a life skill, just like Googling. You need to know how to use email. You're functionally illiterate if you can't.
Your offence was:
I heard you like your attachments...
"Oops! I forgot to attach the document!"
Forgot to engage the brain, more likely. Seriously, both Outlook and GMail will even tell you that it looks like you meant to add an attachment.
Ain't nothing like shooting yourself in the foot after you've been warned...