Welcome to Help Center Premium WordPress Themes, Plugins, SEO Friendly › Forums › Topic Tag: Certificate Ad On Error Viewing topic 1 (of 1 total) Topic Freshness Getting this Error on Certificate Ad On – Call to a member function.. Started by: jayne90 in: LearnPress Premium Add-ons (5 replies) 1 month, 3 weeks ago Julia Viewing topic 1 (of 1 total)