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I create e-learning modules

Liquid error: Solution::ArticleMeta#visible? delegated to solution_folder_meta.visible?, but solution_folder_meta is nil: #<Solution::ArticleMeta id: 103000047877, position: nil, art_type: 1, thumbs_up: 0, thumbs_down: 0, hits: 0, solution_folder_meta_id: 103000631384, account_id: 2461791, created_at: "2023-01-18 09:52:36", updated_at: nil, available: nil, draft_present: nil, published: nil, outdated: nil>