Mostly it shows that message when your device is not active ( communicating with your PC )
It sounds like it could be a few things.
The device gave in, or there is a USB issue ( hardware ) or a corruption ( software.)
Check your device manager to see you dont
have any issues with your USB's. Try using another USB port.
Or Re-Install the driver for your device.
If that does'nt work, try it on another computer.
And if you then still have the same issue. Then I fear the device itself is faulty.
