Minecraft – Why won’t the Minecraft Grinch summon command work

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My friends and I are building a Christmas themed adventure map and one of the 5 challenges is a Grinch battle. It is a Zombie with an invisible guardian on top and the head of a monster. The Guardian and Zombie both have loads of Attributes.
In the command block I put:

/summon Guardian 57 68 381 {ActiveEffects:[0:{Id:14,Duration:9999999,Amplifier:1,ShowParticles:0}],Attributes:[{Name:generic.maxHealth,Base:200},{Name:generic.attackDamage,Base:10}], Riding:{id:Zombie, Attributes:[{Name:generic.maxHealth,Base:200},{Name:generic.movementSpeed,Base:0.2},{Name:generic.attackDamage,Base:10}],{CustomName:Boss,CustomNameVisible:1,Attributes:[{},{},{}],Equipment:[{},{},{},{},{id:skull,Damage:3,tag:{SkullOwner:MHF_Blaze}}],CustomName:Grinch,CustomNameVisible:1}}}

It should in theory work but it doesn't in the bottom of the command block it says this:

Data tag parsing failed: Unable to locate name/value separator for string: {CustomName:Boss,CustomNameVisible:1,Attributes:[{},{},{}],Equipment:[{},{},{},{},{id:skull,Damage:3,tag:{SkullOwner:MHF_Blaze}}],CustomName:Grinch,CustomNameVisible:1}

Please can someone help!

Best Answer

There are superfluous curly braces ({}) around the erroneous string. Remove those. Also, you specify the Zombie's CustomName and CustomNameVisible twice.

When facing data tag syntax problems, it is often helpful to explode the view in a suitable text editor that supports syntax highlighting, such as Notepad++.

Riding:
{
    id:Zombie, 
    Attributes:[
    {
        Name:generic.maxHealth,
        Base:200
    },{
        Name:generic.movementSpeed,
        Base:0.2
    },{
        Name:generic.attackDamage,
        Base:10
    }],
    {
        CustomName:Boss,
        CustomNameVisible:1,
        Attributes:[{},{},{}],
        Equipment:[{},{},{},{},{id:skull,Damage:3,tag:{SkullOwner:MHF_Blaze}}],
        CustomName:Grinch,
        CustomNameVisible:1
    }
}

You can easily see that after closing Attributes, you start a compound tag (open curly braces), but there's no tag to assign this value. Remove these braces, and CustomName: ... is correctly the same level as id and Attributes.

Related Solutions

Minecraft – I spawned giants with the /summon command. Why won’t they do anything

They don't do anything because Giants themselves are unused. Since 1.8, they do not have any AI at all. They're generally unused now and serve no purpose other than decoration.

From the Minecraft Wiki entry:

Giants currently have no AI. The consequence of this is that they always face south when summoned and stay that way, never wandering, turning their head, chasing the player, or responding to damage except for taking knockback. Their viewing direction can only be changed with commands.

Minecraft Commands – Minecraft Villager Summon Command Guide

Each recipe (containing a buy item and a sell item) should be in the Recipe list, looking something like:

Currently, you have the second recipe inside the data of the first recipe's sell item:

The following data should work:

{
    Profession: 3,
    CustomName: "PvP Villager",
    CustomNameVisible: 1,
    Career: 1,
    CareerLevel: 42,
    CanPickUpLoot: 0,
    PersistenceRequired: 1,
    Invulnerable: 1,
    Offers: {
        Recipes: [
            {
                rewardExp: false,
                uses: -2147483648,
                maxUses: 0,
                buy: {
                    id: gold_block,
                    Count: 8
                },
                sell: {
                    id: potion,
                    Count: 1,
                    tag: {
                        HideFlags: 32,
                        CustomPotionEffects: [
                            {
                                Id: 10,
                                Amplifier: 1,
                                Duration: 410
                            },
                            {
                                Id: 22,
                                Amplifier: 3,
                                Duration: 2400
                            },
                            {
                                Id: 11,
                                Amplifier: 0,
                                Duration: 6000
                            },
                            {
                                Id: 12,
                                Amplifier: 0,
                                Duration: 6000
                            }
                        ],
                        display: {
                            Name: "Gods water",
                            Lore: [
                                "Who knew water was so good!"
                            ]
                        }
                    }
                }
            },
            {
                buy: {
                    id: "diamond_block",
                    Count: 8
                },
                maxUses: 9999999,
                sell: {
                    id: "golden_apple",
                    Count: 1,
                    Damage: 1
                },
                rewardExp: false
            }
        ]
    }
}

I'd recommend building up commands and testing them along the way, rather than starting with a long command and adding in brackets to try to fix the errors.

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