如果在我的谷歌搜索中也发现了同样的问题：

/ hacks and mods will go here  This Version is plugin folder
/**
 * Disables BuddyPress\' registration process and fallsback to WordPress\' one.
 */

function my_disable_bp_registration() 
{   
    remove_action( \'bp_init\',    \'bp_core_wpsignup_redirect\' );   
    remove_action( \'bp_screens\', \'bp_core_screen_signup\' ); 
} 
add_action( \'bp_loaded\', \'my_disable_bp_registration\' ); 
add_filter( \'bp_get_signup_page\', "firmasite_redirect_bp_signup_page");

function firmasite_redirect_bp_signup_page($page )
{
    return bp_get_root_domain() . \'/wp-signup.php\';   
}

改变

return bp_get_root_domain() . **\'/wp-signup.php\'**;

return bp_get_root_domain() . **\'/wp-login.php?action=register\'**;