SimpleSchema invalid keys "_id required"

I'm using aldeed:autoform, aldeed:simple-schema, aldeed:collection2 and mdg:validated-method for doing an insert over a collection.

This is the tempalte with the AutoForm:

<template name="Areas_agregar">
  {{> Titulos_modulos title="Areas" subtitle="Agregar" cerrar=true}} 
  {{ 
    #autoForm 
    collection=areasColecction 
    id="areas_agregar" 
    type="method" 
    meteormethod="areas.insert" 
  }} 
  {{> afQuickField name='nombre'}} 
  {{> afArrayField name='subareas'}}

  <button type="submit">Save</button>

  <button type="reset">Reset Form</button>
  {{/autoForm}}
</template>

This is the collection's schema:

Areas.schema = new SimpleSchema({
    _id: { 
        type: String, 
        regEx: SimpleSchema.RegEx.Id 
    },
    nombre: { 
        type: String,
        label: 'Nombre'
    },
    subareas: {
        type: [String],
        label: 'Subareas'
    }
});

And this is the insert method:

const AREA_FIELDS_ONLY = Areas.simpleSchema().pick(['nombre', 'subareas', 'subareas.$']).validator({ clean: true, filter: false });

export const insert = new ValidatedMethod({
    name: 'areas.insert',
    validate: AREA_FIELDS_ONLY,
    run({ nombre, subareas }) {
        const area = {
            nombre, 
            subareas
        };
        Areas.insert(area);
    },
});

And i'm getting the folowing error in Chrome's Dev Console:

SimpleSchema invalid keys for "areas_agregar" context: Array[1] 0: Object name: "_id" type: "required" value: null proto: Object length: 1 proto: Array[0]

Like the error shows, is asking me a value for the _id field, but I'm on an insert update, it doesn't makes any sense.

Any idea what could be going wrong?

autoform treats required keys in the schema as being required in the form input which doesn't work for the _id key.

If you make the _id optional: true then your insert will work and Meteor will automatically insert the _id OR you can use a variation of the schema for the autoform which omits the _id key altogether:

let schemaObject = {
  nombre: { 
    type: String,
    label: 'Nombre'
  },
  subareas: {
    type: [String],
    label: 'Subareas'
  }
};
Areas.formSchema = new SimpleSchema(schemaObject); // use for form
schemaObject._id = { 
  type: String, 
  regEx: SimpleSchema.RegEx.Id 
};
Areas.collectionSchema = new SimpleSchema(schemaObject); // use for collection