Why does my RANT phone say illegal number of files when i switched my 2G memory card over?

I recently switched my memory card over from my old musiq phone. There, apparently are ';too many files'; beacause it tells me that whenever i go to my albums it won't let me open the ';100SSMED'; folder; stating that as it's reason...Why does my RANT phone say illegal number of files when i switched my 2G memory card over?
It could be that the Rant won't support a 2 GB card. I do not believe that it is a music phone, so it might not support all of the media, or even a card that big. I would suggest calling Sprint. (I believe that they are the one's that carry the Rant).