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It looks like the plugin is having trouble finding the wp-load.php file. In the wpdiscuz-ajax.php file, they are substituting the normal ABSPATH constant with their own later on.
PHP Fatal error: require_once(): Failed opening required '/www//wp-load.php' (include_path='.:/usr/share/php') in /www/wp-content/plugins/wpdiscuz/utils/ajax/wpdiscuz-ajax.php on line 13