How to use I2C color sensor

Hello. I ask question for the first time.

I use Grove_I2C_color_sensor with seeeduino v3.0. (http://wiki.seeedstudio.com/Grove-I2C_Color_Sensor/)(http://wiki.seeedstudio.com/Seeeduino_v3.0/)
When I use it and run sample program, Incomprehensible value is displayed.
A negative value is displayed and the values don't changes when I change color.
I put the correct libraries and I perform voltage conversion.
I don't understand what's the problem.

Are thoose 2 boards even compatible with each? And displayed on what. Also could u show us ur code u wrote down?

Wiring correct? Do you see the expected address when you run an I2C scanner?