Error on 'SET_HEATER_TEMPERATURE HEATER=toolhead TARGET=': unable to parse

General Discussion
11 
[gcode_macro load]                                                               # RETIRER L'EXTRUDER
gcode:        
        ...
        {% if params.EXTRUDER_TEMP %}
        SET_HEATER_TEMPERATURE HEATER=heater_toolhead TARGET={EXTRUDER_TEMP}
        {% endif %} 
        ...

You are talking about this part, right?

If so, there is nowhere in this macro where you would pass any EXTRUDER_TEMP.
See Help with Macro: SET_GCODE_VARIABLE doesnt set my variable - #12 by theophile and the following few posts for some information that might be useful.