Reply To: Error 500 activating the plugin Home › Forums › Product Support Forums › Related Posts Pro for WordPress Support › Error 500 activating the plugin › Reply To: Error 500 activating the plugin December 13, 2015 at 7:40 pm #7025 PedroParticipant I think the problem was with the cache. Now is working. The problem continues. I have to deactivate the plugin… This reply was modified 10 years, 5 months ago by Pedro.