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AM3359: How to enable Weston display

Part Number: AM3359


SDK 06_03_00_106

Beaglebone Black

I am trying to enable the Weston Gui and followed the documentation found here.

When I enter in the command "weston --tty=1 --backend=drm-backend.so" I get the following error:

warning: no input devices found, but none required as per configuration.
[03:00:42.846] DRM: head 'HDMI-A-1' found, connector 31 is connected, EDID make 'DEL', model 'DELL S2719DM', serial 'GCR0RS2'
[03:00:42.846] Registered plugin API 'weston_drm_output_api_v1' of size 12
[03:00:42.847] format 0x34325258 not supported by output HDMI-A-1
[03:00:42.847] Failed to init output gl state
[03:00:42.847] Enabling output "HDMI-A-1" failed.
[03:00:42.847] Error: cannot enable output 'HDMI-A-1' without heads.

What are the "heads" they are referring to?