I\'m trying to solve https://leetcode.com/problems/design-linked-list/description/ in Ruby. The only error feedback is \n```ruby\nLine 122: in `helper_select_method\'\n```\nBut my Ruby code is only 115 lines. It seems LeetCode wrapped the code.\n\nCould LeetCode help me solving this platform technical issue? Thanks!

I\'m trying to solve https://leetcode.com/problems/design-linked-list/description/ in Ruby. The only error feedback is \nruby\nLine 122: in `helper_select_metho