Can anyone help me install Klipper on my ender 3?

I’m trying to install Klipper on my ender 3 (base model). I’ve flashed mainsail on my raspberry pi, I flashed Klipper on my ender 3, but whenever I try to go to mainsail, I get: Klipper reports: STARTUP

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

After this, I eventually get a:

Klipper reports: ERROR

mcu ‘mcu’: Unable to connect
Once the underlying issue is corrected, use the
“FIRMWARE_RESTART” command to reset the firmware, reload the
config, and restart the host software.
Error configuring printer

I reflashed marlin then reflashed klipper but no luck. I tried putting both string from the ls commands in the mcu section of the printer.cfg but still nothing. What should I do?
klippy(10).log (173.7 KB)
printer.cfg (2.5 KB)

See Mcu: Serial connection closed / Timeout on connect / Wait for identify_response

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