Romeo Board with I2C Sensor Problem

Hello hello :)

I have the Romeo v2 controller and a Grove-Base Shield with Grove - Digital Light Sensor as a I2C Connection.
[url=http://www.dfrobot.com/wiki/index.php/Romeo_V2-All_in_one_Controller_%28R3%29_%28SKU:DFR0225%29]http://www.dfrobot.com/wiki/index.php/Romeo_V2-All_in_one_Controller_%28R3%29_%28SKU:DFR0225%29[/url]
[url=http://www.seeedstudio.com/wiki/Grove_-_Digital_Light_Sensor]http://www.seeedstudio.com/wiki/Grove_-_Digital_Light_Sensor[/url]
[url=http://www.seeedstudio.com/wiki/Grove_-_Base_Shield_V1.3]http://www.seeedstudio.com/wiki/Grove_-_Base_Shield_V1.3[/url]
Unfortunately, I don't get a response from the Sensor with the example code on the romeo controller. It seems to me, that the I2C pin mapping is wrong somehow, since on other boards the grove sensor gives a response but it does not on the romeo (Leonardo) controller.
[code]#include <Wire.h>
#include <Digital_Light_TSL2561.h>
void setup()
{
Wire.begin();
Serial.begin(9600);
TSL2561.init();
}

void loop()
{
unsigned long Lux;

TSL2561.getLux();

Serial.print("The Light value is: ");
Serial.println(TSL2561.calculateLux(0,0,1));
delay(1000);
}[/code]

Did someone experienced similar problems?