Wordpress older post page error - php

Question

I have a problem with a custom wordpress template.
I've made a categories page. Works fine on the firs view.
But when I make click on 2nd page for older posts, the browser shows me a 404 error.
I think my query needs something more, but I don't know what is or if this is the problem.
Can somebody help, please?
This is my code:
<?php
/**
* The template for displaying Category pages
*/
?>
<?php get_header(); ?>
<?php get_template_part( 'partials/linea-content', 'page' ); ?>
<div class="index categories">
<div class="col-xs-12 pre-content">
<div class="container">
<?php //Para añadir contenido se interesa ?>
</div>
</div>
<div class="container">
<div class="row">
<div class="col-xs-12 categories-title">
<h2>Categoria: <span><?php echo get_category(get_query_var('cat'))->name; ?></span></h2>
</div>
<div id="posts" class="col-xs-12 col-sm-9">
<?php
// set the "paged" parameter (use 'page' if the query is on a static front page)
$paged = ( get_query_var( 'paged' ) ) ? get_query_var( 'paged' ) : 1;
// Cambiamos los argumentos para buscar desde la última
$args = array(
'posts_per_page' => 2,
'orderby' => 'date',
'order' => ASC,
'category__in' => get_category(get_query_var('cat'))->cat_ID,
'paged' => $paged
);
// '&orderby=date&order=ASC&category=' . get_category(get_query_var('cat'))->cat_ID;
// volvemos a crear la consulta principal
$aux = query_posts( $args );
$cont_items = 1;
?>
<?php if ( have_posts() ) : ?>
<div class="row items-row">
<div class="col-xs-12">
<?php while ( have_posts() ) : the_post(); ?>
<!-- post -->
<div id="post-id-<?php echo $post->ID; ?>" class="item col-xs-12 col-sm-6">
<div class="row">
<div class="col-xs-12 text-center item-content">
<span class="meta-category">
<span class="meta-category-inner">
<?php
$cat = get_the_category($post->ID);
?>
<?php echo $cat[0]->name; ?>
</span>
</span>
<?php
global $wpdb;
$ppbv_tablename = $wpdb->prefix . 'popular_by_views';
$currentRow = $wpdb->get_row("SELECT * FROM {$ppbv_tablename} WHERE post_id = {$post->ID}");
$curView = 0;
if(isset($currentRow))
{
$curView = $currentRow->views;
}
?>
<div class="item-title-content">
<a href="<?php the_permalink(); ?>" title="Popsicase">
<h2 class="item-title col-xs-10 col-xs-offset-1"><?php the_title(); ?></h2>
</a>
</div>
<p class="date-cat">
<small class="col-xs-12">
<i class="fa fa-link"></i> <strong><?php the_author(); ?></strong> | <span><i class="fa fa-calendar"></i> <?php echo get_the_date();?> | <i class="fa fa-eye"></i> <?php echo $curView; ?></span>
</small>
</p>
<?php
$img_url = get_template_directory_uri() . '/assets/img/podcast.jpg';
if (get_the_post_thumbnail())
{
$img_url = wp_get_attachment_url(get_post_thumbnail_id($post->ID));
}
?>
<a href="<?php the_permalink(); ?>" title="Popsicase">
<div class="item-thumbnail" style="background:url(<?php echo $img_url; ?>) no-repeat center center;">
</div>
</a>
<div class="row">
<div class="col-xs-6 text-right">
<?php /*<span class="comment"> Comentarios: <?php comments_number( '0','1','%'); ?></span>*/ ?>
</div>
</div>
<div class="item-excerpt text-left">
<div class="col-xs-12">
<?php the_excerpt(); ?>
</div>
</div>
</div>
</div>
</div>
<?php if ($cont_items % 2 == 0) : ?>
</div>
</div>
<div class="row items-row">
<div class="col-xs-12">
<?php
endif;
$cont_items++;
?>
<?php endwhile; ?>
</div>
</div>
<!-- End of the main loop -->
<!-- Add the pagination functions here. -->
<?php
the_posts_pagination( array(
'mid_size' => 4,
'prev_text' => __( 'Artículos antiguos', 'textdomain' ),
'next_text' => __( 'Artículos nuevos', 'textdomain' ),
) );
?>
<?php /*
<div class="nav-previous alignleft"><?php next_posts_link( 'Artículos antiguos' ); ?></div>
<div class="nav-next alignright"><?php previous_posts_link( 'Artículos nuevos' ); ?></div>
*/ ?>
<?php else : ?>
<p><?php _e('Sorry, no posts matched your criteria.'); ?></p>
<?php endif; ?>
</div>
<div class="hidden-xs col-sm-3 sidebar">
<div class="row">
<?php if (!function_exists('dynamic_sidebar') || !dynamic_sidebar('main-sidebar')) : ?>
<?php endif; ?>
</div>
</div>
</div>
</div>
<div class="col-xs-12 pos-content">
<div class="container">
<?php //Para añadir contenido se interesa ?>
</div>
</div>
<div class="clearfix"></div>
</div>