"The hub does not have enough power available to operate the device. Would you like assistance in solving this problem? If you click No, the device may not function properly."
To resolve this symptom, you have to use a USB hub that has an external AC adapter.
This symptom occurs when too many USB devices are connected to the USB hub which is set in the bus power mode (power is supplied by the computer).
If you want to use USB devices with nurmerous number of devices, replace the USB hub in the bus power mode with one which can be powered with an external AC adapter.