YouTube says “error fetching channel list for this account?”?

So I’m a content creator on YouTube and one video I made got a warning. I went to look at a video on that account and then I realized it was another account I use. I tried to get back into the original account, but it wouldn’t let me. What should I say to appeal their decision? I have no idea what to do. I’m just scared because I was doing so well on that account and I don’t want all my hard work to go to waste. 

Update:

For the appeal should I include “I will delete the videos that contain this content”?

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