undefined method `add_comment' for nil:NilClass (NoMethodError) /home/seki/public_html/tdiary/tdiary/defaultio.rb:44:in `restore_comment' /home/seki/public_html/tdiary/tdiary/defaultio.rb:35:in `each' /home/seki/public_html/tdiary/tdiary/defaultio.rb:35:in `restore_comment' /home/seki/public_html/tdiary/tdiary/defaultio.rb:33:in `open' /home/seki/public_html/tdiary/tdiary/defaultio.rb:33:in `restore_comment' /home/seki/public_html/tdiary/tdiary/defaultio.rb:144:in `transaction' /home/seki/public_html/tdiary/tdiary.rb:1755:in `initialize' /home/seki/public_html/tdiary/index.rb:52:in `new' /home/seki/public_html/tdiary/index.rb:52