[
{
   $addFields: {
      Larva: { $toInt: "$Larva" },
      Ninfa: { $toInt: "$Ninfa" },
      Pupa: { $toInt: "$Pupa" },
   }
},
    {
        $group: {
            _id: "",
            "Huevo": {$sum: "$Huevo"},
            "Larva": { $sum: "$Larva" },
            "Ninfa": { $sum: "$Ninfa" },
            "Pupa": { $sum: "$Pupa" }
        },
}
]

I am using a validator and it shows an error and I do not know why.
Capture: https://prnt.sc/8QE8m_fFLWD1

I tried this query in my terminal and it works, but I check it in a json validator and it shows me an error