Testing the connection

When I run this command: sudo i2cdetect -y 1, the next screen verifies the Raspberry Pi is able to detect the GrovePi, but when I try testing the GrovePi by doing this command: cd /home/pi/Dexter/GrovePi/Software/Python
sudo python grove_led_blink.py,
I get the following error:

Traceback (most recent call last);
File “grove_led_blink.py”, Line 37, in
from grovepi import *
File “/home/pi/Dexter/GrovePi/Software/Python/grovepi.py”, line 52, in
import di_i2c
ImportError: No module named di_ic2