Pagination for custom post

Hi all, I have trouble for register custom post and pagination. My custom post type is “ebook” with vode below

register_post_type($this->type,array(
                'label'=>'Ebook Store',
                'labels'=>array(
                    // n/ a
                ),
                'public'=>true,
                'hierarchical'=>false,
                'rewrite'=>array('slug'=>$this->type,'with_front'=>false),
                'query_var'=>true,
                'supports'=>array('title','editor','thumbnail','author'),
            ));

and i write a simple code for pagination like:

<?php
    global $paged;
    $page = $paged==0 ? 1:0;
    $args =array(
        'post_type'=>'eboookstore',
        'paged'=>$page,
        'showposts'=>1,
    );

    $loop = new WP_Query($args);
    if($loop->have_posts()): while($loop->have_posts()): $loop->the_post();
?>

<?php
    the_post_thumbnail('ebook-store');
?>
<br/>
<a href="<?php the_permalink();?>"><?php the_title(); ?></a>
<br>
<?php
    endwhile;endif;
?>

<?php
    $posts_per_page = get_option('posts_per_page');
    $all_book = wp_count_posts('eboookstore');
    $pages = ceil($all_book->publish / $posts_per_page);
    for($i = 1;$i<=$pages;$i++){
        echo '<a href="'.get_pagenum_link($i).'">'.$i.'</a>';
    }
?>

And my trouble is:
– If i don’t create 404.php page in my template, every thing work successful.
– If i create 404.php, i will get “404 page not found” page.

if page url :
http://localhost/wp/?paged=4 –> 404 page
and add to “post_type” to page url:
http://localhost/wp/?paged=4&post_type=ebookstore –> work success

PM: I have read many topics like my case, but not solve this problem.