CDL 02-03 questions

[visionfactory]

Hi! I've just re-watched this concert and I have a few questions hope you can help me with

Question 1!

After TRF medley and happy new your countdown ayu does an MC and I tried to figure what she said I believe it was "If there was an error here it was my fault, please forgive me!"

So my question of course is, which was the error? I noticed in some parts TRF's YU-KI is not sure of which part of the song she should sing along, but as for ayu I didn't noticed her mistake...

Question 2!

So... what happened to ayu's voice in this concert? She sounds like sick or something, she certainly can't hit certain notes, it's very noticeable in Voyage performance particularly she sings "bokutachi wa shia(wa)se ni naru tame" (she can't sing the "wa" part and she also keep skipping this tone through the whole song)