You probably have to disconnect the bluetooth module from pins 0 and 1 in order to upload via the USB port.
Nobody is going to download a .zip'ed manual for you... Maybe you should be studying that manual, not us?
That error is extremely generic; it can be caused by basically any problem other than missing drivers or a bad USB cable. Including the wrong board selected, or the whole board having been chopped in half and the piece iwth the microcontroller on it thrown away.