Call to undefined method App\Models\AttributeSku::fromRawAttributes()

I have this simple structure:

Product model

lass Product extends Model
{
    protected $table = 'products';

	 public function skus(): HasMany
    {
        return $this->hasMany(Sku::class);
    }

    public function attributes(): HasMany
    {
        return $this->hasMany(Attribute::class);
    }
}

Attribute Model

class Attribute extends Model
{
    protected $fillable = [
        'name',
    ];

    public const SIZE = 'size';

    public const COLOR = 'color';

    public const ATTRIBUTES = [
        self::SIZE,
        self::COLOR
    ];

    public function skus(): BelongsToMany
    {
        return $this->belongsToMany(Sku::class)
            ->using(AttributeSku::class)
            ->withPivot('id', 'value');
    }

    public function product(): BelongsTo
    {
        return $this->belongsTo(Product::class);
    }

    public function scopeSize($query): void
    {
        $query->where('name', self::SIZE);
    }

    public function scopeColor($query): void
    {
        $query->where('name', self::COLOR);
    }
}

SKU Model

class Sku extends Model
{
 public function attributes(): BelongsToMany
    {
        return $this->belongsToMany(Attribute::class)
            ->using(AttributeSku::class)
            ->withPivot('id', 'value');
    }

    public function product(): BelongsTo
    {
        return $this->belongsTo(Product::class);
    }
}

AttributeSKU model

class AttributeSku extends Model
{
    protected $fillable = [
        'attribute_id',
        'sku_id',
        'value',
    ];

    protected $table = 'attribute_sku';

    public function sku(): BelongsTo
    {
        return $this->belongsTo(Sku::class);
    }

    public function attribute(): BelongsTo
    {
        return $this->belongsTo(Attribute::class);
    }
}

When I try to access the product model with relation ''skus.attributes'

$products = Product::with(['skus.attributes'])->get()

Call to undefined method App\Models\AttributeSku::fromRawAttributes()

Any idea why?