Rtc error samsung yp-k5

Question

my mp3 will not turn on and when i plug it in into the computer it says that it has an RTC error what can i do and what is this error about

My T10 suddenly will not power up and when I plugged it to the computer, simply display RCT checking, and showed only one of menu display. I love this player. It will be a shame if it cannot be fixed