controller insert (SOLVED)

public function simpan()
    {
        $dbconnect = $this->load->database();
        $this->load->model('mdaftar');

        $this->load->library('upload');
        $nmfile = "file_".time();
        $config['upload_path'] ='./assets/uploads/nik/';
        $config['allowed_types'] = 'gif|jpg|png|jpeg|bmp';
        $config['max_size'] = '2048';
        $config['max_width']  = '1288';
        $config['max_height']  = '768';
        $config['file_name'] = $nmfile;

        $this->upload->initialize($config);

            if ($this->upload->do_upload('nik'))
                {   $gbr = $this->upload->data();
                    if($this->mdaftar->validation() == TRUE){

                        $data1 = array (
                            'nama_perusahaan'=> $this->input->post('namaperusahaan'),
                            'alamat'=> $this->input->post('alamat'),
                            'no_telepon'=> $this->input->post('notelp'),
                            'email'=> $this->input->post('email'),
                            'dokumen_perusahaan'=>$gbr['file_name'],
                            'username'=> $this->input->post('username'),
                            'password'=> $this->input->post('password'),
                        );
                    $this-> mdaftar->simpandaftar($data1);
                    redirect('cdaftar');
                }
                    else
                { $this->signup();
                    }
                }
    }