I actually don’t understand this report.
Ro_Noah via Whonix Forum:
Whonix gateway just turns into a black screen when it boots
Just boot and screen remains black forever?
I think it is causing the browser error on workstation.
What has the browser to do with it when screen remains black after boot?
In case of VirtualBox, please also if its same issue this:
As that forum thread contains error descriptions and possible solutions.