error: XDG_RUNTIME_DIR not set in the environment.

We get error: XDG_RUNTIME_DIR not set in the environment.
[2022.12.02-14.23.31:816][ 0]LogInit: Initializing SDL.
[2022.12.02-14.23.31:821][ 0]LogInit: Warning: Could not initialize SDL: No available video device
[2022.12.02-14.23.31:821][ 0]LogInit: Warning: Could not initialize SDL: No available video device

What is this error telling me?

What should this variable be set too?

JIM