php - Trying to get property 'studentnumber' of non-object codeigniter edit_student

error:

A PHP Error was encountered Severity: Notice

Message: Trying to get property 'studentnumber' of non-object

Filename: users/edit_student.php

Line Number: 21

Backtrace:

File: C:\UniServerZ\www\student_monitoring_responsive\application\views\users\edit_student.php Line: 21 Function: _error_handler

File: C:\UniServerZ\www\student_monitoring_responsive\application\controllers\Students.php Line: 110 Function: view

File: C:\UniServerZ\www\student_monitoring_responsive\index.php Line: 315 Function: require_once

Here is my code: controllers

<?php
    class Students extends CI_Controller
    {
        public function __construct()
        {
            parent::__construct();
            $this->load->model('students_model');
        }
        
        public function students()
        {
            if(!$this->session->userdata('id'))
            redirect('login/index');
            $this->load->view('templates/header');
            $data['students_info'] = $this->students_model->rows();
            $this->load->view('users/students', $data);
            $this->load->view('templates/footer');
        }
        public function edit_student($id)
        {
            if(!$this->session->userdata('id'))
            redirect('login/index');

            $this->form_validation->set_rules('studentno', 'Student Number', 'trim|required');
            $this->form_validation->set_rules('fname', 'First Name', 'trim|required');
            $this->form_validation->set_rules('lname', 'Last Name', 'trim|required');
            $this->form_validation->set_rules('address', 'Address', 'trim|required');
            $this->form_validation->set_rules('contact', 'Contact', 'trim|required');
            $this->form_validation->set_rules('institution', 'Institution', 'trim|required');
            $this->form_validation->set_rules('pgrade', 'Prelim Grade', 'trim|required');
            $this->form_validation->set_rules('mgrade', 'Midterm Grade', 'trim|required');
            $this->form_validation->set_rules('fgrade', 'Final Grade', 'trim|required');
            $this->form_validation->set_rules('agrade', 'Average Grade', 'trim|required');

            if ($this->form_validation->run()) {
                $data = array(
                    'studentnumber'        =>  $this->input->post('studentno'),
                    'firstname'        =>  $this->input->post('fname'), 
                    'middlename'           =>  $this->input->post('mname'),
                    'lastname'        =>  $this->input->post('lname'),
                    'address'        =>  $this->input->post('address'),
                    'contact'        =>  $this->input->post('contact'),
                    'institution'        =>  $this->input->post('institution'),
                    'pgrade'        =>  $this->input->post('pgrade'),
                    'mgrade'        =>  $this->input->post('mgrade'),
                    'fgrade'        =>  $this->input->post('fgrade'),
                    'agrade'        =>  $this->input->post('agrade'),
                );
    
                $result = $this->students_model->edit_student($id, $data);
                if ($result) {
                    $this->students();
                }
            } else {
                $this->load->view('templates/header');
                $data['student_info'] = $this->students_model->row($id);
                $this->load->view('users/edit_student', $data);
                $this->load->view('templates/footer');
            }
        }
    }

?>
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Here is my code: models

<?php

class Students_model extends CI_Model
{
    public function __construct()
    {
        parent::__construct();
        $this->table = 'students';
    }
  
    public function row($id)
    {
        $where = array(
            'id' => $id, 
            'is_deleted' => 0
        );
        $query = $this->db->get_where($this->table, $where);
        return $query->row();
    }

    public function edit_student($id, $data)
    {
        $where = array(
            'id' => $id, 
            'is_deleted' => 0
        );
        $this->db->update($this->table, $data, $where);
        return true;
    }

}
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Here is my code: html

<title>Update Student | Student Monitoring</title>
<link rel="stylesheet" type="text/css" href="<?php echo base_url(); ?>/css/edit.css">
</div>
</nav>
</article>
<main class="articlemain">
    <div class="container-fluid">
        <article class="art1">
            <div class="divheader">
                <b>Update Information</b>
            </div>
            <form action="" method="post">
                <?= form_open('students/students', ['name' => 'studenttedit', 'autocomplete' => 'off']); ?>
                <?php
                if (validation_errors()) {
                    echo validation_errors();
                }
                ?>
                <div class="form-group">
                    <label><b>Student Number*</b></label>
                    <?php echo form_input(['name' => 'studentno', 'class' => 'form-control', 'value' => $student_info->studentnumber]); ?>
                    <?php echo form_error('studentno', "<div style='color:red'>", "</div>"); ?>
                    <label><b>First Name*</b></label>
                    <?php echo form_input(['name' => 'fname', 'class' => 'form-control', 'value' => $student_info->firstname]); ?>
                    <?php echo form_error('fname', "<div style='color:red'>", "</div>"); ?>
                    <label><b>Middle Name</b></label>
                    <?php echo form_input(['name' => 'mname', 'class' => 'form-control', 'value' => $student_info->middlename]); ?>
                    <?php echo form_error('mname', "<div style='color:red'>", "</div>"); ?>
                    <label><b>Last Name</b></label>
                    <?php echo form_input(['name' => 'lname', 'class' => 'form-control', 'value' => $student_info->lastname]); ?>
                    <?php echo form_error('lname', "<div style='color:red'>", "</div>"); ?>
                    <label><b>Address*</b></label>
                    <?php echo form_input(['name' => 'address', 'class' => 'form-control', 'value' => $student_info->address]); ?>
                    <?php echo form_error('address', "<div style='color:red'>", "</div>"); ?>
                    <label><b>Contact*</b></label>
                    <?php echo form_input(['name' => 'contact', 'class' => 'form-control', 'value' => $student_info->contact]); ?>
                    <?php echo form_error('contact', "<div style='color:red'>", "</div>"); ?>
                    <label><b>Institution*</b></label>
                    <?php echo form_input(['name' => 'institution', 'class' => 'form-control', 'value' => $student_info->institution]); ?>
                    <?php echo form_error('institution', "<div style='color:red'>", "</div>"); ?>
                    <label><b>Prelim Grade*</b></label>
                    <?php echo form_input(['name' => 'pgrade', 'class' => 'form-control', 'value' => $student_info->pgrade]); ?>
                    <?php echo form_error('pgrade', "<div style='color:red'>", "</div>"); ?>
                    <label><b>Midterm Grade*</b></label>
                    <?php echo form_input(['name' => 'mgrade', 'class' => 'form-control', 'value' => $student_info->mgrade]); ?>
                    <?php echo form_error('mgrade', "<div style='color:red'>", "</div>"); ?>
                    <label><b>Final Grade*</b></label>
                    <?php echo form_input(['name' => 'fgrade', 'class' => 'form-control', 'value' => $student_info->fgrade]); ?>
                    <?php echo form_error('fgrade', "<div style='color:red'>", "</div>"); ?>
                    <label><b>Average Grade*</b></label>
                    <?php echo form_input(['name' => 'agrade', 'class' => 'form-control', 'value' => $student_info->agrade]); ?>
                    <?php echo form_error('agrade', "<div style='color:red'>", "</div>"); ?>
                </div>
                <?php echo form_submit(['name' => 'submit', 'value' => 'Update', 'class' => 'btn btn-primary']); ?>
                <?php echo form_close(); ?>
            </form>
        </article>
    </div>
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