/**
  * Overloaded function
  *
  * Removes errors for all attributes or a single attribute.
  * @param string $attribute attribute name. Use null to remove errors for all attribute.
  */
 public function clearErrors($attribute = null)
 {
     parent::clearErrors($attribute);
     foreach ($this->tiffinPriceTimeSelectionArr as $row) {
         $row->clearErrors($attribute);
     }
 }