Found 2 elements with non-unique id (#_ajax_nonce) and (#_wpnonce) - ajax

Question

I am developing custom theme from scratch and creates a custom post type and getting this warning while editing custom post type. I also design custom Meta box with two input fields and using nonce in it. Any help removing these warning?
//Custom Metabox
function register_book_meta_box(){
add_meta_box('book_meta_box_id', 'Book Detail','design_book_meta_box','books','advanced','high');
}
add_action('add_meta_boxes','register_book_meta_box');
function design_book_meta_box($post){
wp_nonce_field(basename(__FILE__),'book_cpt_nonce')
?>
<div>
<label for="book-author">Author Name </label>
<input type="text" name="book-author" placeholder="Author Name" value="<?php echo get_post_meta( $post->ID, 'book-author-key', true );?>">
</div>
<div>
<label for="year">Published Year</label>
<input type="number" id="year" name="year" min="1455" max="2020" value="<?php echo get_post_meta( $post->ID, 'book-year-key', true );?>">
<span id="errorMsg" style="display:none;">Published Year Must be range from 1455 - 2020</span>
</div>
<?php
}
function save_book_meta_data($post_id)
{
if(!isset($_POST['book_cpt_nonce']) || !wp_verify_nonce($_POST['book_cpt_nonce'],basename(__FILE__))){
return $post_id;
}
if (array_key_exists('book-author', $_POST)) {
update_post_meta( $post_id,'book-author-key', $_POST['book-author']
);
}
if (array_key_exists('year', $_POST)) {
update_post_meta( $post_id,'book-year-key', $_POST['year']
);
}
}
add_action('save_post', 'save_book_meta_data');