Arduino: 1.6.13 (Mac OS X), Board: "Arduino Nano, ATmega328"

Arduino: 1.6.13 (Mac OS X), Board: “Arduino Nano, ATmega328”

Build options changed, rebuilding all

Sketch uses 928 bytes (3%) of program storage space. Maximum is 30,720 bytes.
Global variables use 9 bytes (0%) of dynamic memory, leaving 2,039 bytes for local variables. Maximum is 2,048 bytes.
Problem uploading to board. See for suggestions.
avrdude: stk500_getsync(): can’t communicate with device: resp=0x41
An error occurred while uploading the sketch

This report would have more information with
“Show verbose output during compilation”
option enabled in File → Preferences.

Do you have the right port selected? Does your Arduino even show up as a serial port? What USB chip does it use?
Common choices are:
ATMEL MEGA16U2 (Official Arduino UNO and some clones)
FTDI FT232RL (Most older clones)
WCH CH340G (Most newer clones)

Mac OS X doesn't tell us what version you are using. There are issues reported for Sierra.
But first follow @johnwasser's advice.

If you got an original Arduino with FTDI chip and you are running Sierra, then you might search for "Sierra, FTDI" via the forum search engine.