Buddypress gives white screen

Hy there i have followed this tutorial https://rtcamp.com/wordpress-nginx/tutorials/multisite/subdomains/fastcgi-cache-with-purging/ everything works good except for buddypress.

As i activate buddypress i get white screen on backend and front end. I do now know what the issue is as so far. I am asking here maybe someone else had this problem and found a fix.

Thank you in advance, i will publish this same thing on nginx forums and on buddypress forums.