Many times you might come across a fatal error when you install a new plugin or a theme on your website. There might be different reasons for this to happen. Here are a some:
# Older Version of Beaver Builder Plugin
You have installed older version of Beaver Builder plugin. Make sure you have installed the latest (1.8+) version of Beaver Builder.
# Older Version of PHP
Your website hosting server is running on older version of PHP. UABB needs minimum PHP 5.4 or newer. To check your PHP version please visit this URL – http://your-website.com/wp-admin/index.php?page=bsf-registration&author#bsf-system
Replace http://your-website.com with your domain name
If your PHP version is older than 5.4 then please contact your hosting provider to upgrade it.
# WordPress Memory Limit
Your WordPress memory is exhausted. Please increase WordPress memory limit. Refer this article to increase memory limit.