Sonic Pad G28 internal error

[madalarcon]

I managed to install BDsensor on sonic pad.
i have the file Bdsensor.py in Klipper/klippy/extra folder
and I flashed again my printer with the modification.
The sensor was recognized I did calibration ok.
the probe was working but... y can't home my printer. X home ok Y home ok but z gives me this error
[ERROR] 2024-07-18 23:24:29,126 [root] [klippy:invoke_shutdown:351] Transition to shutdown state: {"code":"key60", "msg":"Internal error on command:G28", "values": ["G28"]}
[ERROR] 2024-07-18 23:24:29,178 [root] [webhooks:_process_request:262] Internal Error on WebRequest: gcode/script
Traceback (most recent call last):
File "/usr/share/klipper/klippy/webhooks.py", line 256, in _process_request
func(web_request)
File "/usr/share/klipper/klippy/webhooks.py", line 425, in _handle_script
self.gcode.run_script(web_request.get_str('script'))
File "/usr/share/klipper/klippy/gcode.py", line 260, in run_script
self._process_commands(script.split('\n'), need_ack=False)
File "/usr/share/klipper/klippy/gcode.py", line 210, in _process_commands
handler(gcmd)
File "/usr/share/klipper/klippy/extras/safe_z_home.py", line 79, in cmd_G28
self.prev_G28(g28_gcmd)
File "/usr/share/klipper/klippy/extras/homing.py", line 270, in cmd_G28
kin.home(homing_state)
File "/usr/share/klipper/klippy/kinematics/cartesian.py", line 89, in home
self._home_axis(homing_state, axis, self.rails[axis])
File "/usr/share/klipper/klippy/kinematics/cartesian.py", line 76, in _home_axis
homing_state.home_rails([rail], forcepos, homepos)
File "/usr/share/klipper/klippy/extras/homing.py", line 187, in home_rails
hmove.homing_move(homepos, hi.speed)
File "/usr/share/klipper/klippy/extras/homing.py", line 87, in homing_move
triggered=triggered)
File "/usr/share/klipper/klippy/extras/BDsensor.py", line 1199, in home_start
self.trigger_completion, expire_timeout)
TypeError: start() takes 4 positional arguments but 5 were given

I can t update Klipper because it's a sonic pad.
im stuck.