Plugin Errors

And Use enqueues in a function, like:

function my_scripts_method() {
	//Include Javascript library
	wp_enqueue_script('inkthemes', plugins_url( '/js/demo.js' , __FILE__ ) , array( 'jquery' ));
	wp_enqueue_script('jquery-mousewheel', plugins_url( '/js/jquery.mousewheel.js' , __FILE__ ));
	wp_enqueue_script('perfect-scrollbar', plugins_url( '/js/perfect-scrollbar.js' , __FILE__ ));
	wp_enqueue_style('kento-vote-style', KENTO_VOTE_PLUGIN_PATH.'css/style.css');
	wp_enqueue_style('perfect-scrollbar', KENTO_VOTE_PLUGIN_PATH.'css/perfect-scrollbar.css');
}
add_action( 'wp_enqueue_scripts', 'my_scripts_method' );