wrong article

I assume this is what you get for not attending classes
But, I didn't attend class because I didn't want to or something like that
I was just too tired from flu and midterms

So, I found out that I had this assignment due tomorrow
I went through the adversity of reading two articles to choose which one I wanted
I wrote a freaking long summary for f*** sake
well, it is only one page single spaced -___-''

so, while writing, I remembered, I didn't know which article had been assigned
so I went to ACE and wrote mails for every student in my class
(I didn't mail the prof and TAs because they might think I am dumbass)

Many people replied (wow, this class has nice students)
the first two repliers wrote something like:
"You can choose any article that we have already covered up this point. And its not really a summary that you write, more like a personal reflection (likes, dislikes, etc.) - check out the mini assignment description file in the Lessons Tab."

I was like "cool"
so I finished up the assignment and went to bed
I was pumped up the next day, trusting myself in writing a really good summary
that I will get at least 4.5/5 this time.
so I went in to the class, ugh.... 30 minutes late as usual (but it is a good way for prof to remember my face I guess)
it is not because I go to class late on purpose
I have sleeping disorders sometimes, or you call that insomnia
sometimes though.........
end of the point, I handed in my assignment.

I went home, and someone replied my email, I thought..............
it wasn't a reply apparently
it was kind of a notification from my TA

"Hi,
For the mini assignment 2 it was required to discuss one of the readings assigned for either week 4 or week 5. The reading you chose was part of the first round and therefore cannot be graded for this submission. I will give you the opportunity to re-submit to me via email if you wish. Let me know what you decide to do. "

nice...............................................................................................................................................................................................................................................................................................................................
what did she mean by letting her know what I decided to do, it didn't seem to me that I have choice not to write another summary either T_T

but after all, I know that it shouldn't be just me who wrote summary on the wrong article by then since there were 6 students replied me with almost the same content as the first quotation.