uploading picture

I need someone to help me fix this error message:

404 Page Not Found
The page you requested was not found.

After uploading picture and press upload it carries me to this :


views/addslideshows.php

PHP Code:

<td>
                <div style="margin-left: 80px;">
                <div class="row">
                <br><br>
                
                    <div class="col-md-12">
                        <label for="filename" class="control-label">Select File to Upload</label> 
                    </div>
                </div>
                                
                <div class="form-group">
                <div class="row">
                    <div class="col-md-12">
                        <input type="file" name="filename" size="20" />
                        <span class="text-danger"><?php if (isset($error)) { echo $error; } ?></span>
                    </div>
                </div>
                </div>
            
                <div class="form-group">
                    <div class="row">
                        <div class="col-md-12">
                            <input type="submit" class="edit" value="Upload File" class="btn btn-primary"/>
                        </div>
                    </div>
                </div>
                </div>
            <?php /* </div> */ ?>
            </td> 


controllers/cuploadfile.php

PHP Code:

function upload()
    {
        //set preferences
        $config['upload_path'] = 'uploads/';
        $config['allowed_types'] = 'jpg|gif';
        $config['max_size']    = '500000';

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

        if (!$this->upload->do_upload('filename'))
        {
            
            // case - failure
            $upload_error = array('error' => $this->upload->display_errors());
            // $this->load->view('upload_file_view', $upload_error);
            $this->load->view('addslideshows', $upload_error);
        }
        else
        {
            
            // case - success
            $upload_data = $this->upload->data(); 
            $data['success_msg'] = '<div class="alert alert-success text-center">Your file <strong>' . $upload_data['file_name'] . '</strong> was successfully uploaded!</div>';
            // $this->load->view('upload_file_view', $data);
            
            $this->Mpages->add_slideshow();
            
            $this->load->view('addslideshows', $data);
                        
        }
        
                
    } 


Can anyone help me figure this thing out?

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