Notice: session_start(): Redis not available while creating session_id in /srv/www/ on line 15

Warning: session_start(): Failed to read session data: redis (path: tcp:// in /srv/www/ on line 15

Fatal error: Uncaught RuntimeException: Unexpected data in output buffer. Maybe you have characters before an opening <?php tag? in /srv/www/ Stack trace: #0 /srv/www/ Slim\App->finalize(Object(Slim\Http\Response)) #1 /srv/www/ Slim\App->run() #2 {main} thrown in /srv/www/ on line 621