I'm currently updating a custom origins datapack from 1.16 to 1.18 and I keep getting this error message back. I don't think it has to do with the yellow_shulker_box .json itself, because that is supposedly up to date (here's the code below and I'll continue beneath it)

{

    "type": "minecraft:block",

    "pools": [

        {

            "rolls": 1,

            "entries": [

                {

                    "type": "minecraft:alternatives",

                    "children": [

                        {

                            "type": "minecraft:dynamic",

                            "name": "minecraft:contents",

                            "conditions": [

                                {

                                    "condition": "minecraft:match_tool",

                                    "predicate": {

                                        "item": "minecraft:air",

                                        "nbt": "{drop_contents: 1b}"

                                    }

                                }

                            ]

                        },

                        {

                            "functions": [

                                {

                                    "function": "minecraft:copy_name",

                                    "source": "block_entity"

                                },

                                {

                                    "function": "minecraft:copy_nbt",

                                    "source": "block_entity",

                                    "ops": [

                                        {

                                            "source": "Lock",

                                            "target": "BlockEntityTag.Lock",

                                            "op": "replace"

                                        },

                                        {

                                            "source": "LootTable",

                                            "target": "BlockEntityTag.LootTable",

                                            "op": "replace"

                                        },

                                        {

                                            "source": "LootTableSeed",

                                            "target": "BlockEntityTag.LootTableSeed",

                                            "op": "replace"

                                        }

                                    ]

                                },

                                {

                                    "function": "minecraft:set_contents",

                                    "entries": [

                                        {

                                            "type": "minecraft:dynamic",

                                            "name": "minecraft:contents"

                                        }

                                    ]

                                }

                            ],

                            "type": "minecraft:item",

                            "name": "minecraft:yellow_shulker_box"

                        }

                    ]

                }

            ]

        }

    ]

}

 

the files go minecraft -> loot tables -> blocks -> yellow_shulker_box.json 
I may need to add a "tags" folder within the minecraft folder? If so, I'm not sure what to put in it, if that even is the problem.

I don't think anything else in the mod references a yellow shulker box, save for the notes file in the pack's functions folder:

# repair.mcfunction (by me :), RaidTheWeb)

# create temporary shulker box
setblock ~ 255 ~ minecraft:yellow_shulker_box

# add the current item to shulker
data modify block ~ 255 ~ Items[] set from entity @s SelectedItem

# fully repair item
execute store result block ~ 255 ~ Items[0].tag.Damage short 1 run scoreboard players get @s itemDamage

# give the contents of the shulker
loot replace entity @s weapon.mainhand 1 mine ~ 255 ~ minecraft:air{drop_contents:1b}

# clean up afterwards
setblock ~ 255 ~ air replace

 

Any help would be appreciated, please, I just straight up cannot locate where the problem even is at this point in order to fix it.

are you making/updating a mod? because this is a modder support forum.

Crap. I know I'm making a datapack for the Origins mod. If this post isn't allowed here, feel free to delete it or tell me too and I shall. I'm technically.. coding in a mod I think? Do you know of any better servers for... custom minecraft datapack coding? (I'm new to this scene and really have no idea where to get the proper info/help I need)

Ah I've solved it through help on Reddit. It turns out I needed the new updated yellow shulker box json file fixed for 1.18.1
https://lanternmc.com/yellow_shulker_box.json
I'll leave it here for anybody else experiencing difficulty.

Huh, just found this when searching my name, nice effort to update the funny datapack.