Unable to get sensor readings from ambient light sensor SEN0390

I've recently bought a ambient light sensor (SEN0390) and I have tested it on an Arduino and the sensor works as it should. However for my project, I'm using a Sparkfun expLoRaBLE Thing Plus and I'm unable to get any readings. The only thing that shows in the terminal is either -1 lux or 6012954.00 (lux). 

This is the pins connection of the Sparkfun expLoRaBLE Thing plus.

The only thing I changed in the library was the scl and sda pins, as can be seen in the image below:

The schematic of the board with the ambient sensor is shown in the image below: 

The code I'm using: 

Any idea how to fix this? Thank you.