Pixhawk wont read voltage

Hello.

I just finished building my quadcopter, using the new Pixhawk.

When arming, I get the following error:

Avionics power low: 4.3Volt
Preflight checks fail.

What is causing this? I am connected with a 433mhz telemetry radio.

Also, I cannot get Qgrouncontrol to display the voltage or battery status.
I am using a 5 in 1 Damping Plate, with voltage sensor.

Thanks!

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