wp-signup.php redirects to home page when buddypress installed

Hi, I am tried with one problem of buddypress in my multisite. When I installed buddypress plugin, wp-signup.php is redirecting to home page. without buddypress plugin, wp-signup.php is working fine. But I need both.
Note: Network is enabled. I also checked with twenty fifteen theme. I setup pretty permalink. I am using latest version of wordpress and buddypress.
Here I included buddypress setting pages in my site...
Please have a look on included screenshots and help me to solve this issue.