I can not download the files on a server

[eluser]Unknown[/eluser]
Hello! torment a problem - I can not download the files on a server - gives error "You did not select a file to upload.". What's the problem I do not understand.
here's the code:

Code:

function save1(){
$config['upload_path'] = './img_company/';            
                    $this->load->library('upload', $config);
            
                    if ( ! $this->upload->do_upload())
                    {  
                      echo     $this->upload->display_errors();
                        
                    }
                    else
                    {
                       echo  $this->    upload->    data();
                        
                    }
}