E.g. my purpose is to keep rural districts from district quantity cost on certain kinds of planets. Then I added an on_built coding here:

district_generator = {
expansion_planner = yes

base_buildtime = 240

min_for_deposits_on_planet = 3
max_for_deposits_on_planet = 15

zone_slots = {
slot_energy
}

show_on_uncolonized = {
uses_district_set = standard
exists = from
from = { is_wilderness_empire = no }
NOT = { has_modifier = resort_colony }
}

potential = {
uses_district_set = standard
OR = {
NOT = { exists = owner }
AND = {
exists = owner
owner = { is_wilderness_empire = no }
}
}
NOT = { has_modifier = resort_colony }
}

conversion_ratio = 1
convert_to = {
district_generator_uncapped
district_photosynthesis_fields
district_photosynthesis_fields_uncapped
district_nexus_1
district_hive_1
}

resources = {
category = planet_districts_generator
cost = {
minerals = @base_cost
}
upkeep = {
energy = 1
}
}

inline_script = {
script = jobs/technicians_add
AMOUNT = @base_rural_district_jobs
}

planet_modifier = {
planet_housing_add = 200
}

triggered_planet_modifier = {
potential = {
exists = owner
owner = {
has_valid_civic = civic_agrarian_idyll
}
}
modifier = {
planet_housing_add = 300
}
}

triggered_planet_modifier = {
potential = {
exists = owner
owner = { is_gestalt = yes }
}
modifier = {
planet_housing_add = 100
}
}

on_built = {
if = {
limit = {
climate = "dry"
}
add_modifier = {
modifier = planet_max_districts_add
add = 1
days = -1
}
}
}

inline_script = {
script = districts/district_triggered_name_generator
}

inline_script = {
script = districts/district_triggered_flavor_desc_generator
}

prerequisites = {
tech_power_plant_1
}

ai_weight_coefficient = 0.8
}

But it and only it doesn't work. All of my other simply modified codes works well. So if someone could help me on it? Thx in advance!!!