Nothing happen after deleting some group codex in function.php.
@kostasze something’s getting lost in translation. Let’s start with: WP/BP versions? What theme are you using? Why are you removing the group codes from your theme’s functions.php file? Did you do as modemlooper mentioned above?
Rename wp-content/plugins to plugins-off and then try to access your admin.
This will disable all plugins and let you back into site. Once back into site, rename folder back to plugins. If you deleted anything from the BuddyPress folder, go to plugins page in admin and delete and reinstall BuddyPress.
Never remove or delete anything out of the BuddyPress plugin folder.
