Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean

Question

I made a complete eCommerce website on my pc. Everything works properly, i then exported my databases to my laptop and i just copied my code files to my laptop as well. All the files; databases and programming files are exactly the same on my pc and laptop but for some reason i am getting the following error from my laptop on my shop page:Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean. Emphasize, i do not get this error on my pc although the databases and code are exactly the same. Please help.
(xampp version is the same as well)

Code:

<center>
<div id="mainProductDiv">
<?php while($row=mysql_fetch_array($result)){ ?>

<div class="container">
<img src="<?php echo $row['Images']?>" alt="" class="image">
<div class="overlay">
<div class="text">
<a id="addToCart" onclick="numberCart()" href="?id=<?php echo $row['id']?>"> Add To Cart</a></div>
</div>
<h2>Price:R<?php echo $row['price'] ?></h2>
</div>

<?php } ?>
</div>
</center>

Just in case you need to see what the result variable refers to, here is the related code from the beginning of my code:
<?php
session_start();
require 'connect.php';
mysql_select_db('shop',$conn);
$sql='select * from products';
$result=mysql_query($sql);

?>

Answer 1

Maybe mysql_select_db() failed

Answer 2

https://stackoverflow.com/questions/2973202/mysql-fetch-array-mysql-fetch-assoc-mysql-fetch-row-mysql-num-rows-etc?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa