MacOS Sierra

Has anyone had trouble getting the arduino uno to connect to the new macs with only c-ports? I have an adaptor, my board lights up, but the code will not upload to the board. I’m confident in my coding abilities and was just testing out the set up by simply trying to get the LED to blink. Hardware photo attached.

Here’s my code:

int ledPin = 13; // LED connected to digital pin 13

void setup()
{
pinMode(ledPin, OUTPUT); // sets the digital pin as output
}

void loop()
{
digitalWrite(ledPin, HIGH); // sets the LED on
delay(1000); // waits for a second
digitalWrite(ledPin, LOW); // sets the LED off
delay(1000); // waits for a second
}

I’d appreciate any suggestions!

Thanks!

I did go through the troubleshooting steps on the help page as well as google tutorials.

Thanks!