M5StickV Face Detect not working

  • Hello, i'm testing the FaceDetect V-Function of the M5Stick, connect with Grove cable to an M5StickC. I did a simple program on UIFlow wich prints on the display the numbers of faces detected by the StickV, but it seems to detect nothing because the number is always 0. I have burned the StickV with the firmware on M5Burner and i added the UnitV on UIFlow, but the two don't seem to communicate. Some one can help me?