invalidType() публичный статический Метод

public static invalidType ( )
 /**
  * Add a field to the attachment.
  *
  * @param \Spatie\SlashCommand\AttachmentField|array $field
  *
  * @return $this
  *
  * @throws \Spatie\SlashCommand\Exceptions\FieldCannotBeAdded
  */
 public function addField($field)
 {
     if (!is_array($field) && !$field instanceof AttachmentField) {
         throw FieldCannotBeAdded::invalidType();
     }
     if (is_array($field)) {
         $title = array_keys($field)[0];
         $value = $field[$title];
         $field = AttachmentField::create($title, $value);
     }
     $this->fields->push($field);
     return $this;
 }