How to run xwayland server

Dears

I have successfully installed wayland and weston on my board. And I can run weston shown on the monitor. Now I want to run LinuxCNC on my board.

As what I did before when I use X11, I ran the following cmd:

    startx &
    export DISPLAY=:0.0
    xhost +
    linuxcnc

But now I'm using wayland, I don't know what to do. If I run the linuxcnc on weston's terminal, it shows:

LINUXCNC - 2.9.0~pre0
application-specific initialization failed: no display name and no $DISPLAY environment variable
Error in startup script: invalid command name "image"
    while executing
"image create photo -file $f/$i.gif"
    invoked from within
"if [file exists $f/$i.gif] {
            return [image create photo -file $f/$i.gif]
        }"
    (procedure "linuxcnc::image_search" line 7)
    invoked from within
"linuxcnc::image_search linuxcnc-wizard"
    invoked from within
"set logo [linuxcnc::image_search linuxcnc-wizard]"
    (file "/home/tsinglin/linuxcnc-dev/tcl/bin/pickconfig.tcl" line 31)

Can you tell me what to do now?

Thanks Wade Xu