Unable to activate, have BuddyPress installed

I receive an error when I attempt to activate rtMedia. I get the following error

Warning: session_start(): user session functions not defined in /srv/bindings/96eeaa04f2fc4229acd26f74f6d1247c/code/wp-content/plugins/buddypress-media/index.php on line 61 Fatal error: session_start(): Failed to initialize storage module: user (path: ) in /srv/bindings/96eeaa04f2fc4229acd26f74f6d1247c/code/wp-content/plugins/buddypress-media/index.php on line 61

This is a brand new WP install.

Hi snarky, I’m not a Wordpress/Buddypress or rtmedia specialist, but your path seams a little unusual for a Worpress installation. Perhaps you may give us some more details about your installation (OS/Webserver/PHP version). Is your installation compatible with the PHP sessions ? Are you able to connect to the website with a login and password ? Is this a test or a production server ? Thanks.

Yup, you are right. This is a dev server, on Pantheon. I’ve used them for years with Drupal, but this is my first WP with them. My other plugins are working great.

Hello @snarky,

We are not sure if this could be of your help but you can have a look at this thread once: https://pantheon.io/docs/wordpress-sessions/

Thank you.