Can’t get I2c to work on Jetson TK1 using color sensor

Desperately been working about a month to try to get our C++ code to work on the Jetson TK1 I2c. We have a gen 2 3.3 volt color sensor. The wires are properly put into 2, 16, 18, 20

The device is recognized on 0x39 but when we run the code to return color values, we get only zeroes.
The color sensor is a rev robotics v2 (tmd37821)

It’s in the jetson folder

Thank you so much for any help you can give!