Multiple definition of PK0

[laptop-laptop]

Hello, I am using a Prusa i3MK3S+. The filament sensor is connected to an Einsy Rambo board at PK0. I was able to use the wonderful codes provided here but when I tried to use them with https://github.com/spooknik/FLAP
I went into problem.

As mentioned in Step 4 of the Installation of FLAP, I assigned the filament sensor using

switch_pin: !PK0

in flap_main.cfp and commented out the section for "button for unloading".
https://github.com/spooknik/FLAP/wiki/Installation

Klipper gave an error:

pin PK0 used multiple times in config

I went to /config/klipper-prusa-mk3s/mk3s to comment out the switch_pin: !PK0 in einsy-rambo.cfg but then it gave another error:

Option 'switch_pin' in section 'filament_switch_sensor fsensor' must be specified

Please help to resolve this issue. Thanks