array to string coversion

ini kenapa array to string conversion ya?

bagian path $detail2

ini error nya

A PHP Error was encountered

Severity: Notice

Message: Array to string conversion

Filename: controllers/site.php

Line Number: 508

  public function do_upload()
        {

            $is_logged_in = $this->session->userdata('is_logged_in');
            $type = $this->session->userdata('type');
            if(!isset($is_logged_in) || $is_logged_in != true)
            {
                $data['error'] = 'YOU MUST SIGN IN FIRST!';
                $data ['tag']= 'login';
                $data['main_content'] = 'login';
                $this->load->view('include/users_template', $data);
            }
        else
        {
         $config['upload_path']   = './uploads/';
         $config['allowed_types'] = 'docx|pdf';
         $config['max_size']      = 20000;

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

         if ( ! $this->upload->do_upload('userfile')) {
            $error = array('error' => $this->upload->display_errors());
            $data['error'] = $this->upload->display_errors();
            $data ['tag']= 'printaskusers';
            $data['main_content'] = 'printaskusers';
            $this->load->view('include/users_template', $data);
         }

         else {
            $data = array('upload_data' => $this->upload->data());
                        $this->load->model('createorder_model');
            $this->load->model('konfirmasi_model');
            $this->load->model('penetapanharga_model');
            $count = $this->createorder_model->countorder();
            $detail = array(
                    'order_id' => date('Ym').'0'.$count+1,
                    'customer_id' => $this->session->userdata('pID'),
                    'notes' => $this->input->post('notes'),
                    'total_page' => $this->input->post('totalpage'),
                    'color_page' => $this->input->post('colorpage'),
                    'black_page' => $this->input->post('blackpage'),
                    'delivery_cost' => $this->input->post('deliverycost'),
                    'total_payment' => $this->input->post('totalpayment'),
                    'latitude' => $this->input->post('latitude'),
                    'longitude' => $this->input->post('longitude'),
                    'referral' => $this->input->post('usereferral'),
                    'order_status' => 1,
                    'cover_type' => $this->input->post('covertype'),
                    'order_type'    => $this->input->post('ordertype'),
                    'payment_type' => $this->input->post('paymenttype'),
                    'address' => $this->input->post('alamatantar'),
                    'created_at' => date('Y-m-d H:i:m'),
                    'updated_at' => date('Y-m-d H:i:m')
            );
            $detail2 = array(
                'name' => $this->upload->data('file_name'),
                'path' => 'uploads/'.$this->upload->data('file_name'),
                'order_id' => date('Ym').'0'.$count+1,
                'created_at' => date('Y-m-d H:i:m'),
                'updated_at' => date('Y-m-d H:i:m')
            );
            $this->createorder_model->create_file('file', $detail2);
            $this->createorder_model->create_order($detail);
            $data['rows'] = $this->konfirmasi_model->ConfirmviewAllCover();
            $data['rows2'] = $this->konfirmasi_model->ConfirmviewAllOrderType();
            $data['rows3'] = $this->konfirmasi_model->ConfirmviewAllPayment();
            $data['rows4'] = $this->konfirmasi_model->ConfirmviewAllOrder();
            $data['rows5'] = $this->penetapanharga_model->RincianHarga();
            $data['rows6'] = $this->konfirmasi_model->UploadFile();
            $data['error'] = 'You have created an order';
            $data ['tag']= 'konfirmasiorder';
            $data['main_content'] = 'konfirmasiorder';
            $this->load->view('include/users_template', $data);