Can't display the lemobar

i've followed the instruction on https://github.com/windelicato/dotfiles/wiki/bspwm-for-dummies for install bspwm and add the lemonbar,i can run bspwm but the lemonbar is nothing?
this is my ~/.xinitrc :
..................................
session=${1:-2bwm}
case $session in
dwm ) exec dwm;;
2bwm ) exec 2bwm;;
bspwm ) exec bspwm;;
xmonad ) exec xmonad;;
gnome ) exec gnome-session;;
gnome-classic ) exec gnome-session --session=gnome-classic;;
*) exec $1;;
esac

sxhkd &
keybinding is work for me but the problem only lemonbar.

[myugan]

What the problem?