Hm.... that has happened to me but when I was creating a website by code or was when I was animating a thing for my computer apps class... (by code means typing all the codes and using HTML to create by hand, not using any temples or website design programs)
I was about to learn/make a game but summer vacation was only a week away. so know time to learn it.
I also had to add tabs to different pages, text, pictures, backgrounds, videos, music.... it was a long lesson and I learner to leave no mistakes then u have to fix it then upload it again to the server
yeah... im just glad i had few mistakes at the end that i could fix up real quick. But i wonder why some of the mp3 files didn't work.... but oh well mabye next time when i do it again ill get it right. but who knows why.....