why i have error with this maccro ?

[unkempt igloo]

[fan_generic Auxiliary_fan]
pin: PD12
#cycle_time: 0.05
kick_start_time: 0.5
max_power: 1.0
shutdown_speed: 0
heater: chamber_heater

[celest hornet]

Ahoi @unkempt igloo!
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[steel swift]

So, I might be wrong here, I am not an expert in klipper but, for my understanding a generic fan is not coupled to a temperature controlled device like an extruder and has no option to bound with. I think what you are really looking for is: https://www.klipper3d.org/Config_Reference.html?h=heat#heater_fan

[harsh quest]

A fan_generic is only controlled manually

[wooden canyon]

The error is pretty obvious. The generic_fan has no option heater.
Use a heater_fan as referenced by kwad or remove the heater option.

[unkempt igloo]

thank you all

[unkempt igloo]

how can I manually control the fan in question in addition to being a heater_fan

[hazy kraken]

that is not possible. either it is controlled by klipper (heater_fan), or by you (generic_fan). both are not possible...