Everything is working fine now. Thanks.

Please go to Dashboard > wpForo > Boards edit the board you see and change the slug to /community-2/. Then save it and try the SQL again.

If the  button doesn't solve the issues. Please use the SQl commands below in your hosting service cPanel > phpMyAdmin Database Manager > WordPress Database > SQL Tab. In case you're not familiar with hosting service tools, please contact to your hosting service support team and forward them this message with the SQL command.

Problem fixer SQL commands:

SET AUTOCOMMIT = 0;
SET sql_mode='NO_AUTO_VALUE_ON_ZERO';

INSERT INTO `wp_wpforo_boards` (`boardid`, `title`, `slug`, `pageid`, `modules`, `locale`, `is_standalone`, `excld_urls`, `status`, `settings`) 
                VALUES(0, 'The69Forum Forum', 'community', 72, 
                    '{\"tags\":true,\"subscriptions\":true,\"mentioning\":true,\"follows\":true,\"notifications\":true,\"logging\":true,\"seo\":true,\"antispam\":true,\"akismet\":true,\"rss\":true,\"social\":true,\"revisions\":true,\"bookmarks\":true,\"wpforo-user-custom-fields\":true,\"wpforo-private-messages\":true,\"wpforo-mycred\":true,\"wpforo-topic-prefix\":true,\"wpforo-tenor\":true,\"wpforo-giphy\":true,\"wpforo-advanced-attachments\":true,\"wpforo-embeds\":true,\"wpforo-topic-custom-fields\":true,\"wpforo-syntax-highlighter\":true,\"wpforo-cross-posting\":true,\"wpforo-ad-manager\":true,\"wpforo-polls\":true,\"wpforo-emoticons\":true,\"wpforo-woocommerce-memberships\":true}', 
                        'en_US', 0, '[]', 1, '{\"title\":\"The69Forum Forum\",\"desc\":\"The69Forum Discussion Board\"}');

;SET AUTOCOMMIT = 1;

When I am trying to run this query in SQL it is showing this error - 

#1062 - Duplicate entry 'community' for key 'unique_slug'.

Please help quick my forum is empty.