BuddyPress.org

@envira Go into your database, where you host all your files. Find the file: .htaccess.

It should be in the root of your wordpress.

Scroll down to the end of the file and add this:

`LoadModule rewrite_module modules/mod_rewrite.so`

It has to do with your .htaccess. Are you sure you put the module code listed in the correct file??

There are several other solutions that may fit you. All it takes is some researching

https://buddypress.org/community/groups/how-to-and-troubleshooting/forum/topic/seeing-page-not-found-on-activity-members-groups-blogs-tabs/#post-46478

https://buddypress.org/community/groups/how-to-and-troubleshooting/forum/topic/seeing-page-not-found-on-activity-members-groups-blogs-tabs/#post-69444

http://premium.wpmudev.org/forums/topic/page-not-found-error-404

https://buddypress.org/community/groups/installing-buddypress/forum/topic/the-requested-url-register-was-not-found-on-this-server/

Also, I went on the site listed, and it seems you did something to change the permalinks. For example, your activity is linked to %site%/wp/activity??

If you changed permalinks, you must update the .htaccess file.

Thats why your permalinks arn’t working correctly.

Read through this:

https://codex.wordpress.org/Using_Permalinks