どんなことでお困りですか？

Liquid error: Solution::ArticleMeta#visible? delegated to solution_folder_meta.visible?, but solution_folder_meta is nil: #<Solution::ArticleMeta id: 68000022339, position: nil, art_type: 1, thumbs_up: 0, thumbs_down: 0, hits: 0, solution_folder_meta_id: 68000060515, account_id: 4883954, created_at: "2026-04-24 11:13:38.000000000 +0900", updated_at: nil, available: nil, draft_present: nil, published: nil, outdated: nil>