|From DJ Techtools|
The reason is simple and stated in the error message: Your hardware simply deliver enough juice to your MIDI devices.
As the MIDI devices use alot of power these days, with LED lights flashing all over the place, you probably will experience this in the future aswell. DJ Techtools has written an article that's all about MIDI (They do make really good articles). The latest one is explaining this very issue and what to do to fix this problem.