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if($this->input->file('userfile')){ //This is line 219
    $config['upload_path'] = './uploads/';
    $config['allowed_types'] = 'gif|jpg|png';
    $config['max_size']    = '1000';
    $config['max_width']  = '1024';
    $config['max_height']  = '768';

    $this->upload->initialize($config);
    $this->load->library('Multi_upload');

    $files = $this->multi_upload->go_upload();
    //var_dump($files);
    if ( ! $files )
    {
        $error = $this->upload->display_errors();
        echo $error;
        return false;
    }
    else
    {
        $data3 = array();
        foreach ($files as $idx => $name) {
            //var_dump($name['name']);
            $data3[] = array(
                'relation' => $id_residence,
                'images' => $name['name'],
            );
        };
        $data333 = $this->db->insert_batch('hotel_image', $data3);
    }
}

$myInput = $this->input->file('userfile');
if(!empty($myInput)){
    ...
    ...
}