Function for events overtime

[Shacore 0]

I want to make a mod that increase the price of certain resource overtime(for example every X years starting from year Y), i think its possible through events but i dont know how to include the code, what language i need and how would i combine it with events variables. Maybe someone can give me an example?

[Shacore 0]

i tried this(to increase price of grain once) and sometimes event doesnt even occur and when it occurs it does absolutely nothing, just the window pops up but the price is still the same

id=domojega
title=domojegas
desc=domojegass

popUp=true

image=economy.png

show_in_missions=true
mission_image=3

only_once=true

trigger_and
next_and
exact_day=1=1=2025
trigger_and_end

option_btn
name=Accept the price increase
price_change_up=0=20=5=120=1  
ai=100
option_end

this is logs.txt
 

java.lang.NumberFormatException: For input string: "1  "
    at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
    at java.lang.Integer.parseInt(Integer.java:580)
    at java.lang.Integer.parseInt(Integer.java:615)
    at aoc.kingdoms.lukasz.events.EventsManager.loadEvent(EventsManager.java:2618)
    at aoc.kingdoms.lukasz.events.EventsManager.loadEvents(EventsManager.java:1094)
    at aoc.kingdoms.lukasz.events.EventsManager.loadEvents(EventsManager.java:1025)
    at aoc.kingdoms.lukasz.menus.InitGame.initGame(InitGame.java:1046)
    at aoc.kingdoms.lukasz.menus.InitGame.draw(InitGame.java:93)
    at aoc.kingdoms.lukasz.menu.MenuManager.draw(MenuManager.java:2076)
    at aoc.kingdoms.lukasz.menu.MenuManager.draw(MenuManager.java:1982)
    at aoc.kingdoms.lukasz.jakowski.Renderer.Renderer.renderUI(Renderer.java:572)
    at aoc.kingdoms.lukasz.jakowski.Renderer.Renderer.render(Renderer.java:550)
    at aoc.kingdoms.lukasz.jakowski.AA_Game.render(AA_Game.java:213)
    at com.badlogic.gdx.backends.lwjgl3.Lwjgl3Window.update(Lwjgl3Window.java:430)
    at com.badlogic.gdx.backends.lwjgl3.Lwjgl3Application.loop(Lwjgl3Application.java:181)
    at com.badlogic.gdx.backends.lwjgl3.Lwjgl3Application.<init>(Lwjgl3Application.java:153)
    at aoc.kingdoms.lukasz.jakowski.desktop.DesktopLauncher.main(DesktopLauncher.java:108)
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
    at java.util.ArrayList.rangeCheck(ArrayList.java:657)
    at java.util.ArrayList.get(ArrayList.java:433)
    at aoc.kingdoms.lukasz.menusInGame.InGame_Event.<init>(InGame_Event.java:83)
    at aoc.kingdoms.lukasz.menu.MenuManager.rebuildInGame_Event(MenuManager.java:4510)
    at aoc.kingdoms.lukasz.events.EventsManager$9.update(EventsManager.java:846)
    at aoc.kingdoms.lukasz.jakowski.Game.updateSimpleTask(Game.java:1560)
    at aoc.kingdoms.lukasz.jakowski.Renderer.Renderer.update(Renderer.java:849)
    at aoc.kingdoms.lukasz.jakowski.Renderer.Renderer.render(Renderer.java:503)
    at aoc.kingdoms.lukasz.jakowski.AA_Game.render(AA_Game.java:213)
    at com.badlogic.gdx.backends.lwjgl3.Lwjgl3Window.update(Lwjgl3Window.java:430)
    at com.badlogic.gdx.backends.lwjgl3.Lwjgl3Application.loop(Lwjgl3Application.java:181)
    at com.badlogic.gdx.backends.lwjgl3.Lwjgl3Application.<init>(Lwjgl3Application.java:153)
    at aoc.kingdoms.lukasz.jakowski.desktop.DesktopLauncher.main(DesktopLauncher.java:108)