If you feel the video was taken down in error then, you can still appeal the strike on your account. Here's more info on that: https://goo.gl/rjyZ3u . Hope this helps.
Looks like you've received a copyright strike, there are a few ways to resolve it– wait for it to expire, get a retraction, or submit a counter notification. Note that deleting a video with a strike won’t resolve the strike. More details here: https://goo.gl/YkBvnN