BuddyPress.org

Hi everyone when i access to https://vidtubeworld.com/members/test/ ,i get this message as following

Fatal error: Uncaught Error: Call to undefined function bp_is_user_forums() in /var/www/wordpress/wp-content/themes/moview/members/single/home.php:85 Stack trace: #0 /var/www/wordpress/wp-includes/template.php(724): require() #1 /var/www/wordpress/wp-content/plugins/buddypress/bp-core/bp-core-template-loader.php(155): load_template(‘/var/www/wordpr…’, false) #2 /var/www/wordpress/wp-content/plugins/buddypress/bp-core/bp-core-template-loader.php(61): bp_locate_template(Array, true, false) #3 /var/www/wordpress/wp-content/plugins/buddypress/bp-core/bp-core-template-loader.php(338): bp_get_template_part(‘members/single/…’, NULL) #4 /var/www/wordpress/wp-content/plugins/buddypress/bp-members/classes/class-bp-members-theme-compat.php(212): bp_buffer_template_part(‘members/single/…’, NULL, false) #5 /var/www/wordpress/wp-includes/class-wp-hook.php(288): BP_Members_Theme_Compat->single_dummy_content(”) #6 /var/www/wordpress/wp-includes/plugin.php(206): WP_Hook->apply_filters(”, Array) #7 /var/www/wordpress/wp-content/plu in /var/www/wordpress/wp-content/themes/moview/members/single/home.php on line 85
There has been a critical error on your website.

In addition when i signup new account then i login to account success,only homepage still show Guest Login, i access to another page then i can see the loged-in user and avatar on the page header(you can check it by register accounr on my site
How can i resolve this problem. Thanks you