500 Internal Server Error

bad date (TDiary::TDiaryError)

/public/pub7/home7/oct/html/chaos/tdiary.rb:1896:in `rescue in initialize'
/public/pub7/home7/oct/html/chaos/tdiary.rb:1883:in `initialize'
(plugin/navi_user.rb):50:in `new'
(plugin/navi_user.rb):50:in `block (3 levels) in load_plugin'
(plugin/navi_user.rb):47:in `each'
(plugin/navi_user.rb):47:in `block (2 levels) in load_plugin'
/public/pub7/home7/oct/html/chaos/tdiary.rb:817:in `call'
/public/pub7/home7/oct/html/chaos/tdiary.rb:817:in `block in header_proc'
/public/pub7/home7/oct/html/chaos/tdiary.rb:816:in `each'
/public/pub7/home7/oct/html/chaos/tdiary.rb:816:in `header_proc'
(TDiary::Plugin#eval_src):5:in `block in eval_src'
/public/pub7/home7/oct/html/chaos/tdiary.rb:805:in `eval'
/public/pub7/home7/oct/html/chaos/tdiary.rb:805:in `block in eval_src'
/public/pub7/home7/oct/html/chaos/tdiary.rb:115:in `safe'
/public/pub7/home7/oct/html/chaos/tdiary.rb:804:in `eval_src'
/public/pub7/home7/oct/html/chaos/tdiary.rb:1155:in `do_eval_rhtml'
/public/pub7/home7/oct/html/chaos/tdiary.rb:1092:in `eval_rhtml'
/public/pub7/home7/oct/html/chaos/tdiary.rb:1870:in `eval_rhtml'
index.rb:81:in `<main>'