Hi,

Please talk to your host providers and tell them to update your PHP version to 7 or higher, that will fix the issue quickly. The reason why that is showing is because we have written code in our themes in a high standard that is still not supported by some older versions of PHP.

Also check the PHP settings, these can lead to the issue, if you're already using 7+ PHP version.

PHP Recommendations

Memory Size: memory_limit = 256M
Script execution time: max_execution_time = 400
Number of input variables: max_input_vars = 4000

If you don’t have access to the php.ini file, you can add the following values in your .htaccess file:

php_value max_execution_time 400
php_value memory_limit 256M
php_value upload_max_filesize 10M

Be careful using these settings, some hosting companies don’t allow users to change php settings, if you experience any problem after making these changes, please revert these in your .htaccess file, using your FTP client.

Kind Regards