[Solved] Fatal error: Call to undefined function the_post_thumbnail() in . . .

Today i was working on a WordPress based website which needed a custom featured posts widget to be created when I received some error.

The widget used this code to get the post thumbnail:

<?php the_post_thumbnail( array(87, 112, true) ); ?>

Let’s not go into much details of this function (you can find it in wordpress codex).

However, when I used this function and refreshed the page using widget, it gave me an error saying:

Fatal error: Call to undefined function the_post_thumbnail() in ****/******/********/*****/***** on line 13

This might seem like a nightmare at first! but relax. This is because you didn’t tell WordPress that your theme is going to use this function to display thumbnails.

Solution:

To solve the issue of fatal error with the_post_thumbnail() function, simply add this code in your WordPress theme’s functions.php file:

add_theme_support('post-thumbnails');

And now this will remove the error from your WordPress blog / site while using this function.

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