The song audio file should also be of reasonable quality. Try and source mp3 files yourself - ripping them from a streaming video site often results in low quality audio with high file sizes. The bitrate of a beatmap's audio file should be no lower than 128kbps and no higher than 256kbps. If you are having trouble acquiring an appropriate audio file, contact one of the more audio-savvy BAT - they will be more than happy to find one for you.Sadly, the 320 kbps bit rate mp3 you used for this map is not rankable under the new ranking standards.
If you want to re-encode the mp3 yourself, here is a nice guide to help you.
Otherwise, you can post on this thread to ask for help.
Edit: T_T, ztrot posted first