Wordpress 5.0 error after installing plugin

[jucali87]

I just tried installing the plugin to change the Storefront Woocommerce theme in WP 5.0, but after uploading the file and activating the plugin, the following error appears when I try to load any page in my site:

Warning: require_once(custom/functions.php): failed to open stream: No such file or directory in /home/nacional/public_html/wp-content/plugins/theme-customisations.php on line 34

Fatal error: require_once(): Failed opening required 'custom/functions.php' (include_path='.:/usr/local/php71/pear') in /home/nacional/public_html/wp-content/plugins/theme-customisations.php on line 34

I had to go into cPanel and manually delete theme-customisations.php for my site to go back to functioning.