While we can't cover specifics, this typically means that the content is not original. Here's more about reused content & how you can avoid it in future videos: https://goo.gl/Vnir3S . Note that you can always reapply after 30 days from when you've received the decision email.
You're going to run into this over and over again, as Youtube puts premium on new content more then anything else, especially with the rise of Compliation videos that DONT use something like your form. Problem is, I don't see that changing soon.
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Sadly, you get caught in the crossfire of those compilation channels that took without permission and ended up being a pretty big scourge on YT for original creators there for a bit. I think in time they'll do better to separate the "right" from the "wrong", but it'll take time.
End of conversation
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