unclead\multipleinput\TabularInput::init PHP Method

    public function init()
    {
        if (empty($this->models)) {
            throw new InvalidConfigException('You must specify "models"');
        }
        if ($this->form !== null && !$this->form instanceof ActiveForm) {
            throw new InvalidConfigException('Property "form" must be an instance of yii\\widgets\\ActiveForm');
        }
        foreach ($this->models as $model) {
            if (!$model instanceof Model) {
                throw new InvalidConfigException('Model has to be an instance of yii\\base\\Model');
            }
        }
        parent::init();
    }