WP Internal error 500 with nubuilder plugin

  • hi
    we have wordpress 5.1.1 running on a dedicated linux centos 7 install:
    apache – 2.4.6
    php – 7.3.3
    wordpress – 5.1.1

    wordpress seems to be running fine as i can access all sections in the admin menu. i can successfully install and activate the nubuilder plugin from the plugin manager in WP.
    once nubuilder is active, i get the nubuilder button at the top of the left side menu in WP.
    when i click on the nubuilder button it shows the ‘start nubuilder’ button.
    when i click on this, i get:
    This page isn’t working 192.168.1.76 is currently unable to handle this request.
    HTTP ERROR 500

    i have tried re creating the .htaccess file and also defining PHP RAM to 64M.
    i enabled a log file and captured the data below when i try and start nubuilder plugin in WP.
    >>>>>>>>>>>>>>>>>
    [29-Mar-2019 01:26:45 UTC] PHP Notice: Constant DB_HOST already defined in /var/www/html/wp-content/plugins/nubuilder-forte/nubuilder-include.php on line 14
    [29-Mar-2019 01:26:45 UTC] PHP Notice: Constant DB_NAME already defined in /var/www/html/wp-content/plugins/nubuilder-forte/nubuilder-include.php on line 15
    [29-Mar-2019 01:26:45 UTC] PHP Notice: Constant DB_USER already defined in /var/www/html/wp-content/plugins/nubuilder-forte/nubuilder-include.php on line 16
    [29-Mar-2019 01:26:45 UTC] PHP Notice: Constant DB_PASSWORD already defined in /var/www/html/wp-content/plugins/nubuilder-forte/nubuilder-include.php on line 17
    [29-Mar-2019 01:26:45 UTC] PHP Notice: Constant DB_CHARSET already defined in /var/www/html/wp-content/plugins/nubuilder-forte/nubuilder-include.php on line 18
    >>>>>>>>>>>>>>>>>>>

    any help or ideas on resolving this would be greatly appreciated.
    thanks
    ryan

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