single-product.php not opening - php

Question

I have created a set of pages. In first page product.php all the custom categories are shown (title and image). If a user clicks on it then it moves to the taxonomy-product_categories page where products are shown of the specific category. Now i want that if user clicks on the product then it goes to single-product.php page.
code is here
<?php
get_header();
$slug = get_queried_object()->slug; // get clicked category slug
$name = get_queried_object()->name; // get clicked category name
$tax_post_args = array(
'post_type' => 'products', // your post type
'posts_per_page' => 999,
'orderby' => 'id',
'order' => 'ASC',
'tax_query' => array(
array(
'taxonomy' => 'product_categories', // your taxonomy
'field' => 'slug',
'terms' => $slug
)
)
);
?>
<div id="main-wrap">
<div class="container">
<?php
$counter = 1;
$tax_post_qry = new WP_Query($tax_post_args);
if ($tax_post_qry->have_posts()) {
while ($tax_post_qry->have_posts()) {
$tax_post_qry->the_post();
$the_url = wp_get_attachment_image_src(get_post_thumbnail_id($post->ID), $type);
//var_dump($the_url);
if ($counter % 4 == 0) {
echo '<div class="row product-gallery">';
}
?>
<div class="col-sm-3">
<div class="product-warp">
<div class="product">
<img src="<?php echo $the_url[0] ?>" title="" alt="">
</div>
<div class="product-name">
<h5>
<a href="">
<?php echo get_the_title();
; ?>
</a>
</h5>
</div>
</div>
</div>
<?php
if ($counter % 4 == 0) {
echo '</div>';
}
?>
<?php
}
}
?>
</div>
</div>
<?php get_footer(); ?>
this is the place where user clicks then it should go to single-product.php
<a href="#"><img src="<?php echo $the_url[0] ?>" title=""
Somebody guide me step by step please

Answer 1

If your post_type => products Then your file name must be like this single-products.php
Read this article
And for precautions (if the page not open yet. means give 404 error) go to
admin panel
settings
permalinks
First save permalinks as plain and refresh your site home page.
Then save permalinks as post_name and again refresh your home page
Hope this will help you.

Answer 2

Please Try
'post_type' => 'products'
Your Post type is “products”.
And wordpress ruls is “single-{post_type}.php”.
You make “single-products.php” and remove “single-product.php”
https://codex.wordpress.org/Post_Type_Templates