This is the error I receive while trying to upload to the Arduino. I have installed FTDI drivers for mac. (http://www.ftdichip.com/Drivers/VCP/MacOSX/FTDIUSBSerialDriver_v2_2_18.dmg)
The board is part of a quadcopter: https://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=50460
The processor is an Atmel 328P. Do I have the correct drivers?
What else could be the issue?