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Liquid error: Solution::ArticleMeta#visible? delegated to solution_folder_meta.visible?, but solution_folder_meta is nil: #<Solution::ArticleMeta id: 43000051494, position: nil, art_type: 1, thumbs_up: 0, thumbs_down: 0, hits: 0, solution_folder_meta_id: 43000599193, account_id: 906353, created_at: "2018-08-20 17:23:53", updated_at: nil, available: nil, draft_present: nil, published: nil, outdated: nil>