PXFlow Blinking Red (Mission Planner)

Hi there

I am trying to connect a PXFlow to Mission Planner, but I receive NaN value for opt_m_x and opt_m_y. Except for the opt_x and opt_y (which show random values - I think this is ok), all of the other parameters are 0.
I can’t calibrate its image in the latest version of Mission Planner, because it doesn’t show up, and when I connect to the Pixhawk I get absolutely no data from it, since I can’t enable the PXFlow in the Pixhawk.
Also, the Red (or Orange) LED in the PXFlow is blinking (I assume this is some kind of error).

Can anybody help me?