Framebuf library incomplete ? MONO_HLSB

[lejibxl]

I try to get working a library for my display with Framebuf
My display is a LS013B4DN04 with HLSB

But in my the framebuf.MONO_HLSB (=3 — monochrome (1 byte), define 1 byte bit for horizontal pixels) is unknown.
I receive this message "'MONO_HLSB' is not defined"

if I force value to 3, "fb = framebuf.FrameBuffer(buf, 96, 96, 3 )"
I receive this message "ValueError: invalid format"