500 Internal Server Error

bad date (TDiary::TDiaryError)

./tdiary.rb:899:in `initialize'
(plugin/00default.rb):244:in `new'
(plugin/00default.rb):244:in `calc_links'
(plugin/00default.rb):239:in `each'
(plugin/00default.rb):239:in `calc_links'
(plugin/00default.rb):205:in `load_plugin'
./tdiary/plugin.rb:108:in `call'
./tdiary/plugin.rb:108:in `header_proc'
./tdiary/plugin.rb:107:in `each'
./tdiary/plugin.rb:107:in `header_proc'
(TDiary::Plugin#eval_src):4:in `eval_src'
./tdiary/plugin.rb:96:in `eval_src'
./tdiary/core_ext.rb:82:in `safe'
./tdiary/core_ext.rb:80:in `call'
./tdiary/core_ext.rb:80:in `safe'
./tdiary/plugin.rb:95:in `eval_src'
./tdiary.rb:214:in `do_eval_rhtml'
./tdiary.rb:162:in `eval_rhtml'
./tdiary.rb:779:in `eval_rhtml'
./tdiary/dispatcher/index_main.rb:43:in `run'
./tdiary/dispatcher/index_main.rb:6:in `run'
./tdiary/dispatcher.rb:21:in `dispatch_cgi'
index.rb:36