Failing to start klipper

[Evaldaz33]

Hi all,
Succesfully managed to start plugin, had some dificulty with wiring, but main problem is that when hit Start Up Printer, relay starts printer, and waits for printer start, but Klipper connects to host, but get printer not ready error.

Klipper: Connecting ...
21:03:55 Klipper: Connected to host
21:03:55 Connected to host via /tmp/printer @250000bps
21:03:55 Firmware version: 4c8d24a
21:03:57 Printer is not ready
21:03:57 Klipper state: Disconnect
Printer is not ready
The klippy host software is attempting to connect. Please
retry in a few moments.
21:03:57 Printer is not ready
21:03:57 Printer is not ready
The klippy host software is attempting to connect. Please
retry in a few moments.
21:03:58 Printer is not ready
21:03:58 Printer is not ready
The klippy host software is attempting to connect. Please
retry in a few moments.
21:03:58 Printer is not ready
21:03:58 Printer is not ready
The klippy host software is attempting to connect. Please
retry in a few moments.
21:03:58 Printer is not ready
21:03:58 Printer is not ready
The klippy host software is attempting to connect. Please
retry in a few moments.
21:03:58 Printer is not ready
21:03:58 Printer is not ready
The klippy host software is attempting to connect. Please
retry in a few moments.
21:03:58 Printer is not ready
21:03:58 Printer is not ready
The klippy host software is attempting to connect. Please
retry in a few moments.
21:03:58 Klipper: Disconnected from host

And when try Status, I get Lost communication with MCU 'mcu'

Another problem is with wiring, that is given. If I cut L wire on cable, relay "hangs" on ON state, and won't turn off, Solved with cuting N wire on cable, and connecting to relay.