Request could not be performed because of an I/O...

Question

i have plugged my sansa c140 into my usb and at first it told me that there was no disk on e: and now it says "request could not be performed because of and I/O device errori have a clatronic mp3 player when i connect my mp3 player to my pc and i wanna open it i cant because of an "I/O device error" could u help me please