DocumentController::initializeFile

protected function initializeFile($fileId)
{
	$this->file = File::loadById($fileId, array('STORAGE'));
	if(!$this->file)
	{
		$this->errorCollection->add(array(new Error(Loc::getMessage('DISK_DOC_CONTROLLER_ERROR_COULD_NOT_FIND_FILE'), self::ERROR_COULD_NOT_FIND_FILE)));
		$this->sendJsonErrorResponse();
	}
}