500 Internal Server Error

uninitialized constant TDiary::Plugin::OpenURI (NameError)

(plugin/nicovideo.rb):125:in `nicovideo'
(TDiary::Plugin#eval_src):686:in `eval_src'
./tdiary/plugin.rb:97:in `eval_src'
./tdiary/core_ext.rb:90:in `safe'
./tdiary/core_ext.rb:88:in `call'
./tdiary/core_ext.rb:88:in `safe'
./tdiary/plugin.rb:96:in `eval_src'
./tdiary/base.rb:62:in `do_eval_rhtml'
./tdiary/base.rb:29:in `eval_rhtml'
./tdiary/view.rb:236: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