Trouble with wp_enqueue_script

//sidedish slide script  
function sidedish_slide_script() {  

  // No need to register jquery.js  

  wp_register_script( 'add-sd-js',  
     get_theme_file_uri('/form-slider/formslider.js'),  
     array('jquery'), null, true );  

  wp_register_style( 'add-sd-css',  
    get_theme_file_uri('/form-slider/styles.css'),array(), null,'screen' );  

  wp_enqueue_script ('add-sd-custom');  
  wp_enqueue_style ('add-sd-css');  
}  
add_action('wp_enqueue_scripts','sidedish_slide_script');