Printer is not ready The klippy host software is attempting to connect. Please retry in a few moments

my printer is not connecting to klipper.
in ssh it shows I device but in a fluid it not connecting, in fluid it says “Printer is not ready The klippy host software is attempting to connect. Please retry in a few moments”


what should I do ??
I tried changing USB cable and tried every USB port in raspberry pi
klippy.log

mcu 'rpi': Starting connect
mcu 'rpi': Unable to open port: [Errno 2] No such file or directory: '/tmp/klipper_host_mcu'

This issue is your rpi MCU. Run through the install process again to make sure you didn’t miss something.

https://www.klipper3d.org/RPi_microcontroller.html#install-the-rc-script

still not working, any other idea??