Grammer error?

In level 2 lesson 9.9  - Reflexives in the past - Agreements in past

for the sentence, Mon amie se les est coupés par accident - it says the past participle has taken on a masculine singular -s ending!

I think it is supposed to say masculine plural instead of singular

Yes, you're correct, Vani. It's obviously a typo. As you must've known, coupés must agree with les.

Merci, Robert :-)

Hi guys, 
Great spotting, Vani219. You are correct that this is a typo and it has now been fixed up. 
All the best!

Thanks a lot I was confused as well.