Validation pronlem with standard upload script and forms

Code:
function do_upload()

    {

        $this->load->model('user');

        $this->load->model('document');

        $data['sections'] = $this->user->_getSections();

        $data['stats'] = $this->user->_getStats();

        $data['error'] = array('error'=>'');

        $config['upload_path'] = './uploads/';

        $config['allowed_types'] = 'txt|doc|gif|jpg|png|pdf';

        $config['max_size']    = '1024'; //1 meg

        $config['max_width']  = '0';

        $config['max_height']  = '0';

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

        

        // SET VALIDATION RULES

        $this->form_validation->set_message('is_range', 'Access Level must be a number from 1-5');

        $this->form_validation->set_message('is_category', 'Category is a required');

        $this->form_validation->set_message('is_section', 'Section is required');

        $this->form_validation->set_rules('section[]', 'section', 'is_section');

        $this->form_validation->set_rules('lst_category[]', 'category', 'is_category');

        $this->form_validation->set_rules('typeofdoc', 'document type', 'required');

        $this->form_validation->set_rules('accesslevel', 'access level', 'is_range|required');

        $this->form_validation->set_rules('documentname', 'document name','required');

        

        $this->form_validation->set_rules('ownersname', 'owner surname', 'alphanumeric');

        

        $this->form_validation->set_rules('ownerfname', 'owner first name','alphanumeric');

        

        $this->form_validation->set_rules('owneremailaddress','owners email','valid_email');

        

        $this->form_validation->set_rules('project', 'project', 'alphanumeric');

        $this->form_validation->set_rules('division', 'division', 'alphanumeric');

        $this->form_validation->set_rules('startvalidity', 'start date of validity', 'alphanumeric');

        $this->form_validation->set_rules('endvalidity', 'end date of validity', 'alphanumeric');

        $this->form_validation->set_rules('docref', 'document reference', 'alphanumeric');

        

        $this->form_validation->set_rules('docnotes', 'document notes', 'alphanumeric');

        

        $this->form_validation->set_rules('startvalidty', 'start date of validity', 'alphanumeric');

        $this->form_validation->set_rules('location', 'location', 'alphanumeric');

        $this->form_validation->set_rules('startvalidty', 'start date of validity', 'alphanumeric');

        $this->form_validation->set_rules('revdate', 'review date', 'alphanumeric');



        //get form vars

        $section = $this->input->post('section');

        $category = $this->input->post('lst_category');

        $typeofdoc = $this->input->post('typeofdoc');

        $accesslevel = $this->input->post('accesslevel');

        

        $documentname = $this->input->post('documentname');

        $ownerfname = $this->input->post('ownerfname');

        $ownersname = $this->input->post('ownersname');

        $owneremailaddress = $this->input->post('owneremailaddress');

        

        $company = $this->session->userdata('CompanyName');;

        $division = $this->input->post('division');

        $project = $this->input->post('project');

        $location = $this->input->post('location');

        

        $startvalidity = $this->input->post('startvalidity');

        $endvalidity = $this->input->post('endvalidity');

        

        $docref = $this->input->post('docref');

        

        $revdate = $this->input->post('revdate');

        $docnotes = $this->input->post('docnotes');

        $userfile = $this->input->post('userfile');

        $UserID = $this->session->userdata('UserID');



        //get this users document cap

        $documentCap = $this->session->userdata('NoOfDocs');

        $companyName= $this->session->userdata('CompanyName');

        

        

        //get this companies document usage thus far

        $usedDocs = $this->user->_getDocumentsUsed($companyName);

        

        // total docs available if any

        $totalDocs = $documentCap - $usedDocs;

        

        

        if($totalDocs < 1)

        {

            $chkUpload = false;

        }

        else

        {

            $chkUpload = true;

        }



        if ( ! $this->upload->do_upload() || $this->form_validation->run() == false || @$chkUpload == false)

        {

            if(@$chkUpload == false)

            {

                $data['caperror'] = "Your document limit has been reached";

            }

            $data['error'] = array('error'=>$this->upload->display_errors());

            $this->load->view('uploaddocument_view', $data);

        }    

        else

        {

            $data['upload_data'] = $this->upload->data();    

            $size = $data['upload_data']['file_size'];

            $filename = $data['upload_data']['orig_name'];

            $this->document->_storeDocument($section,$category,$typeofdoc,$accesslevel,$documentname,$ownerfname,$ownersname,$owneremailaddress,$company,$division,$project,$location,$startvalidity,$endvalidity,$filename,$size,$docref,$revdate,$docnotes);

            //$this->load->view('managedocument_view', $data);

            redirect('managedocument/index/');

        }

    }