DCA1000EVM: Error -11 (mmWave Studio xWR6843)

Part Number: DCA1000EVM

Tool/software:

Hi, 
I followed the instructions for running mmWave Studio (2.1.1.0) https://dev.ti.com/tirex/explore/content/radar_toolbox_3_10_00_05/hardware_docs/dca1000_perDevice/dca1000_mmwave_studio_xWR1xxx_xWR6843.html.
The following error occurs when loading the firmware: [RadarAPI]: Error: ReadRegister failed with error -11 

The error persists even after a complete restart. Unfortunately, I was unable to find out anything about the error code.
I would be very grateful for any information.

Best regards,

Mat