7yu7

gives me this error

I read the documentation but i didnt understand how to make it on the server side

and how do i make it on server? sorry im pretty new to modding

In my mod I made it so it gives you an item but if i try to interact with it just Disappears here is my code package com.yusuf.PotatoMod.events; import com.yusuf.PotatoMod.potatoMod; import com.yusuf.PotatoMod.utils.RegistryHandler; import net.minecraft.entity.player.PlayerEntity; import net.minecraft.item.ItemStack; import net.minecraft.item.Items; import net.minecraftforge.api.distmarker.Dist; import net.minecraftforge.client.event.InputUpdateEvent; import net.minecraftforge.eventbus.api.SubscribeEvent; import net.minecraftforge.fml.common.Mod; @Mod.EventBusSubscriber(modid = potatoMod.MOD_ID, bus = Mod.EventBusSubscriber.Bus.FORGE, value = Dist.CLIENT) public class ModClientEvents { @SubscribeEvent public static void onShiftEvent(InputUpdateEvent e){ PlayerEntity p = e.getPlayer(); if (p.isSneaking()){ if(p.inventory.hasItemStack(new ItemStack(RegistryHandler.POTATO_CHESTPLATE.get())) && p.inventory.armorItemInSlot(2).getItem() == RegistryHandler.POTATO_CHESTPLATE.get()) { if(p.inventory.hasItemStack(new ItemStack(RegistryHandler.POTATO_HELMET.get())) && p.inventory.armorItemInSlot(3).getItem() == RegistryHandler.POTATO_HELMET.get()) { if(p.inventory.hasItemStack(new ItemStack(RegistryHandler.POTATO_LEGGINGS.get())) && p.inventory.armorItemInSlot(1).getItem() == RegistryHandler.POTATO_LEGGINGS.get()) { if(p.inventory.hasItemStack(new ItemStack(RegistryHandler.POTATO_BOOTS.get())) && p.inventory.armorItemInSlot(0).getItem() == RegistryHandler.POTATO_BOOTS.get()) { p.addItemStackToInventory(new ItemStack(Items.POTATO, 1)); } } } } } } }