I had the exact same error, and I noticed that I was able to upload code successfully only when I started working and wouldn't be able to upload subsequent times afterwards.
This worked for me:
5) The board is set up to auto-reset when you load a…
Hello, I've been lurking for quite a while b/c I didn't really have anything to say, other than fawning adulation. That having been said, I'm a huge fan of what Chris and Jordi are doing, and I've been looking for something like the ArduPilot for ye…