500 Internal Server Error

undefined method `<' for nil:NilClass (NoMethodError)

/virtual/zazi/public_html/tdiary/core_ext.rb:73:in `safe'
/virtual/zazi/public_html/tdiary/config.rb:200:in `load_cgi_conf'
(tdiary.conf):348:in `load'
/virtual/zazi/public_html/tdiary/config.rb:105:in `eval'
/virtual/zazi/public_html/tdiary/config.rb:105:in `load'
/virtual/zazi/public_html/tdiary/config.rb:10:in `initialize'
/virtual/zazi/public_html/tdiary/dispatcher/index_main.rb:8:in `new'
/virtual/zazi/public_html/tdiary/dispatcher/index_main.rb:8:in `run'
/virtual/zazi/public_html/tdiary/dispatcher.rb:26:in `dispatch_cgi'
index.rb:35:in `<main>'