Troubleshooting Modhandler bug

KEYWORD: Bug

An error i encountered here is about an _modhandler re-defined when i was using the block editor i didn't even use the Custom element. So i am bugged here. I don't know how to fix it

package net.mcreator.electricityautomation.procedures;

/* imports omitted */

public class DroneOnEntityTickUpdateProcedure {

    public static void execute(LevelAccessor world, double x, double z, Entity entity) {

        if (entity == null)

            return;

        if ((entity instanceof DroneEntity _datEntI ? _datEntI.getEntityData().get(DroneEntity.DATA_portn) : 0) == 1) {

            if (x == (entity instanceof DroneEntity _datEntI ? _datEntI.getEntityData().get(DroneEntity.DATA_x2) : 0) && z == (entity instanceof DroneEntity _datEntI ? _datEntI.getEntityData().get(DroneEntity.DATA_z2) : 0)) {

                if (entity instanceof DroneEntity _datEntSetL)

                    _datEntSetL.getEntityData().set(DroneEntity.DATA_isDroneflying, false);

                entity.setDeltaMovement(new Vec3(0, (-20), 0));

                if (entity.getCapability(Capabilities.ItemHandler.ENTITY, null) instanceof IItemHandlerModifiable _modHandler) {

                    ItemStack _setstack = (entity.getCapability(Capabilities.ItemHandler.ENTITY, null) instanceof IItemHandlerModifiable _modHandler ? _modHandler.getStackInSlot(0).copy() : ItemStack.EMPTY).copy();

                    _setstack.setCount((entity.getCapability(Capabilities.ItemHandler.ENTITY, null) instanceof IItemHandlerModifiable _modHandler ? _modHandler.getStackInSlot(0).copy() : ItemStack.EMPTY).getCount());

                    _modHandler.setStackInSlot(1, _setstack);

                }

                if (entity.getCapability(Capabilities.ItemHandler.ENTITY, null) instanceof IItemHandlerModifiable _modHandler) {

                    ItemStack _setstack = (itemFromBlockInventory(world, BlockPos.containing(entity instanceof DroneEntity _datEntI ? _datEntI.getEntityData().get(DroneEntity.DATA_x2) : 0,

                            entity instanceof DroneEntity _datEntI ? _datEntI.getEntityData().get(DroneEntity.DATA_y2) : 0, entity instanceof DroneEntity _datEntI ? _datEntI.getEntityData().get(DroneEntity.DATA_z2) : 0), 0).copy()).copy();

                    _setstack

                            .setCount(

                                    itemFromBlockInventory(world,

                                            BlockPos.containing(entity instanceof DroneEntity _datEntI ? _datEntI.getEntityData().get(DroneEntity.DATA_x2) : 0,

                                                    entity instanceof DroneEntity _datEntI ? _datEntI.getEntityData().get(DroneEntity.DATA_y2) : 0, entity instanceof DroneEntity _datEntI ? _datEntI.getEntityData().get(DroneEntity.DATA_z2) : 0),

                                            1).getCount());

                    _modHandler.setStackInSlot(0, _setstack);

                }

                if (world instanceof ILevelExtension _ext && _ext.getCapability(

                        Capabilities.ItemHandler.BLOCK, BlockPos.containing(entity instanceof DroneEntity _datEntI ? _datEntI.getEntityData().get(DroneEntity.DATA_x2) : 0,

                                entity instanceof DroneEntity _datEntI ? _datEntI.getEntityData().get(DroneEntity.DATA_y2) : 0, entity instanceof DroneEntity _datEntI ? _datEntI.getEntityData().get(DroneEntity.DATA_z2) : 0),

                        null) instanceof IItemHandlerModifiable _itemHandlerModifiable) {

                    ItemStack _setstack = (entity.getCapability(Capabilities.ItemHandler.ENTITY, null) instanceof IItemHandlerModifiable _modHandler ? _modHandler.getStackInSlot(0).copy() : ItemStack.EMPTY).copy();

                    _setstack.setCount((entity.getCapability(Capabilities.ItemHandler.ENTITY, null) instanceof IItemHandlerModifiable _modHandler ? _modHandler.getStackInSlot(0).copy() : ItemStack.EMPTY).getCount());

                    _itemHandlerModifiable.setStackInSlot(0, _setstack);

                }

            } else {

                if (entity instanceof Mob _entity)

                    _entity.getNavigation().moveTo((entity instanceof DroneEntity _datEntI ? _datEntI.getEntityData().get(DroneEntity.DATA_x2) : 0),

                            ((entity instanceof DroneEntity _datEntI ? _datEntI.getEntityData().get(DroneEntity.DATA_y2) : 0) + 3), (entity instanceof DroneEntity _datEntI ? _datEntI.getEntityData().get(DroneEntity.DATA_z2) : 0), 2);

                if (entity instanceof DroneEntity _datEntSetL)

                    _datEntSetL.getEntityData().set(DroneEntity.DATA_isDroneflying, true);

            }

        } else {

            if (x == (entity instanceof DroneEntity _datEntI ? _datEntI.getEntityData().get(DroneEntity.DATA_x1) : 0) && z == (entity instanceof DroneEntity _datEntI ? _datEntI.getEntityData().get(DroneEntity.DATA_z1) : 0)) {

                if (entity instanceof DroneEntity _datEntSetL)

                    _datEntSetL.getEntityData().set(DroneEntity.DATA_isDroneflying, false);

                entity.setDeltaMovement(new Vec3(0, (-20), 0));

                if (entity.getCapability(Capabilities.ItemHandler.ENTITY, null) instanceof IItemHandlerModifiable _modHandler) {

                    ItemStack _setstack = (entity.getCapability(Capabilities.ItemHandler.ENTITY, null) instanceof IItemHandlerModifiable _modHandler ? _modHandler.getStackInSlot(0).copy() : ItemStack.EMPTY).copy();

                    _setstack.setCount((entity.getCapability(Capabilities.ItemHandler.ENTITY, null) instanceof IItemHandlerModifiable _modHandler ? _modHandler.getStackInSlot(0).copy() : ItemStack.EMPTY).getCount());

                    _modHandler.setStackInSlot(1, _setstack);

                }

                if (entity.getCapability(Capabilities.ItemHandler.ENTITY, null) instanceof IItemHandlerModifiable _modHandler) {

                    ItemStack _setstack = (itemFromBlockInventory(world, BlockPos.containing(entity instanceof DroneEntity _datEntI ? _datEntI.getEntityData().get(DroneEntity.DATA_x1) : 0,

                            entity instanceof DroneEntity _datEntI ? _datEntI.getEntityData().get(DroneEntity.DATA_y1) : 0, entity instanceof DroneEntity _datEntI ? _datEntI.getEntityData().get(DroneEntity.DATA_z1) : 0), 0).copy()).copy();

                    _setstack

                            .setCount(

                                    itemFromBlockInventory(world,

                                            BlockPos.containing(entity instanceof DroneEntity _datEntI ? _datEntI.getEntityData().get(DroneEntity.DATA_x1) : 0,

                                                    entity instanceof DroneEntity _datEntI ? _datEntI.getEntityData().get(DroneEntity.DATA_y1) : 0, entity instanceof DroneEntity _datEntI ? _datEntI.getEntityData().get(DroneEntity.DATA_z1) : 0),

                                            1).getCount());

                    _modHandler.setStackInSlot(0, _setstack);

                }

                if (world instanceof ILevelExtension _ext && _ext.getCapability(

                        Capabilities.ItemHandler.BLOCK, BlockPos.containing(entity instanceof DroneEntity _datEntI ? _datEntI.getEntityData().get(DroneEntity.DATA_x1) : 0,

                                entity instanceof DroneEntity _datEntI ? _datEntI.getEntityData().get(DroneEntity.DATA_y1) : 0, entity instanceof DroneEntity _datEntI ? _datEntI.getEntityData().get(DroneEntity.DATA_z1) : 0),

                        null) instanceof IItemHandlerModifiable _itemHandlerModifiable) {

                    ItemStack _setstack = (entity.getCapability(Capabilities.ItemHandler.ENTITY, null) instanceof IItemHandlerModifiable _modHandler ? _modHandler.getStackInSlot(0).copy() : ItemStack.EMPTY).copy();

                    _setstack.setCount((entity.getCapability(Capabilities.ItemHandler.ENTITY, null) instanceof IItemHandlerModifiable _modHandler ? _modHandler.getStackInSlot(0).copy() : ItemStack.EMPTY).getCount());

                    _itemHandlerModifiable.setStackInSlot(0, _setstack);

                }

            } else {

                if (entity instanceof Mob _entity)

                    _entity.getNavigation().moveTo((entity instanceof DroneEntity _datEntI ? _datEntI.getEntityData().get(DroneEntity.DATA_x1) : 0),

                            ((entity instanceof DroneEntity _datEntI ? _datEntI.getEntityData().get(DroneEntity.DATA_y1) : 0) + 3), (entity instanceof DroneEntity _datEntI ? _datEntI.getEntityData().get(DroneEntity.DATA_z1) : 0), 2);

                if (entity instanceof DroneEntity _datEntSetL)

                    _datEntSetL.getEntityData().set(DroneEntity.DATA_isDroneflying, true);

            }

        }

    }



    private static ItemStack itemFromBlockInventory(LevelAccessor world, BlockPos pos, int slot) {

        if (world instanceof ILevelExtension ext) {

            IItemHandler itemHandler = ext.getCapability(Capabilities.ItemHandler.BLOCK, pos, null);

            if (itemHandler != null)

                return itemHandler.getStackInSlot(slot);

        }

        return ItemStack.EMPTY;

    }

}*

And i need support to help in this issue