Problem with UtaPri Music 2

Hello everyone!

I've just downloaded from here and installed UtaPri Music 2 on my PSP but everytime I try to play, my PSP restarts.

This is the first time happening to me since I have already downloaded almost all games from this post and none of them had this kind of problem.

If you know how to solve this, please tell me m(__ __)m

Thanks!☆