"Basic with Callbacks" example. Works fine for Nano, but fails on the Arduino Mega 2560 - it can't compile the sketch Build options changed, rebuilding all In file included from /Users/redacted/Lib ...

compilation terminated. exit status 1 Error compiling for board Arduino Nano.

To fix Arduino upload error, make sure you've selected the right board in the Arduino IDE, remove pins from the board, and reset the board.