error Test Notifications

[Kipjr]

Filled in device and API key for Pushbullet. Click "Test Notifications":

There was a problem sending one or more notifications. Please check the logs

• Dec 13, 2018 10:54:34.485 [3144] Error— [com.plexapp.plugins.plexrequestschannel] Sending command over HTTP (GET): /video/requestchannel/{somekey}/sendtestemail
• Dec 13, 2018 10:54:34.485 [3144] Error— HTTP requesting GET http://IP:PORT/video/requestchannel/{somekey}/sendtestemail
• Dec 13, 2018 10:54:34.785 [3144] Error— HTTP 304 response from GET http://IP:PORTvideo/requestchannel/{somekey}/sendtestemail
• Dec 13, 2018 10:54:34.786 [3144] Error— [com.plexapp.plugins.plexrequestschannel] HTTP reply status 304, with 0 bytes of content.
• Dec 13, 2018 10:54:34.790 [1256] Error— Completed: [::ffff:IP:PORT] 304 GET /video/requestchannel/{somekey}/sendtestemail (9 live) TLS GZIP 331ms 418 bytes (pipelined: 1)

What is going on and how do I get these notifications working? This is by the way the first time I've used it.