Carrington Mobile Issue – How to solve featured image not showing in WordPress Dashboard

Carrington Mobile theme is one of the fastest theme that when used on any mobile site performs well in terms of speed and SEO. I have used Carrington Mobile theme for a long time but one problem with it is that the theme is outdated in terms of PHP version. Because of this many encounter issue with the theme but never know how to fix it.
I have managed to be fixing all the issues about Carrington theme.
Today I upgraded to the latest WordPress and php only to notice that my featured image is not there anymore on WordPress admin dashboard.  I tested other default themes as normal and found out it was perculiar to Carrington Mobile theme alone. Infact Ii did not delay but to debug the issue. Below is how you can fix the error featured image not showing on wordpress admin dashoard. Please not you mayneed to do a backup of your site before continuing.
If you have encountered this and has been unable to fix featured image not showing on  wordpress dashboard then here is the quick fix to the issue.

1. Log in to your cpanel or use FTP
2. locate your function.php file and
3. Add below code just before the closing tag at the end.

// This theme uses post thumbnails
add_theme_support( 'post-thumbnails' );
 Once you add the code visit back and you will find out the featurd image must have started displaying. If you are satisfied with this quick fix please do share to people that may need it. Also note that I have naijaloaded mobile theme if you want it message me.