Protected Content plugin, /protected-content/ notification page not showing


When non-members hit my protected pages they are getting this error instead of the "/protected-content/" page specified in the "Membership Pages" page of the plugin settings:

Warning: Creating default object from empty value in / on line 353

Warning: Cannot modify header information - headers already sent by (output started at / in / on line 1179

- Viewing the "Protected Content" page also results in a 404 error (

- I have already tried updating the permalinks and re-installing the plugin.
- Previously, I noticed this issue ( which I was able to workaround by entering the full URL to my protected content page (i.e.,, but it appears that this workaround no longer works after the most recent update.

Please advise.