Iconfont Manager Error "Couldn’t add the font because the server didn’t respond"

I get the “Couldn’t add the font because the server didn’t respond” when trying to add an icon set from Flaticon. This is my apache output:

[Thu Apr 06 02:05:37.113488 2017] [:error] 
PHP Fatal error:  Uncaught Error: Call to a member function attributes() on null in /var/www/mywebsite.com/html/wp-content/themes/enfold/config-templatebuilder/avia-template-builder/php/font-manager.class.php:204
Stack trace:
#0 /var/www/mywebsite.com/html/wp-content/themes/enfold/config-templatebuilder/avia-template-builder/php/font-manager.class.php(57): avia_font_manager->create_config()
#1 /var/www/mywebsite.com/html/wp-includes/class-wp-hook.php(298): avia_font_manager->add_zipped_font('')
#2 /var/www/mywebsite.com/html/wp-includes/class-wp-hook.php(323): WP_Hook->apply_filters('', Array)
#3 /var/www/mywebsite.com/html/wp-includes/plugin.php(453): WP_Hook->do_action(Array)
#4 /var/www/mywebsite.com/html/wp-admin/admin-ajax.php(91): do_action('wp_ajax_avia_aj...')
#5 {main}  thrown in /var/www/mywebsite.com/html/wp-content/themes/enfold/config-templatebuilder/avia-template-builder/php/font-manager.class.php on line 204, referer: https://www.mywebsite.com/wp-admin/admin.php?page=avia

Line 204 of font-manager.class.php is:
$font_attr = $xml->defs->font->attributes();

I am uploading the standard zip from Flaticon which can be found in the private link below. Any assistance would be appreciated!